< draft-palattella-6tsch-terminology-00.txt   draft-palattella-6tsch-terminology-01.txt >
6TSHC MR. Palattella, Ed. 6TSCH MR. Palattella, Ed.
Internet-Draft SnT/Univ. of Luxembourg Internet-Draft SnT/Univ. of Luxembourg
Intended status: Informational P. Thubert Intended status: Informational P. Thubert
Expires: September 11, 2013 cisco Expires: January 16, 2014 cisco
T. Watteyne T. Watteyne
Linear Technology / Dust Networks Linear Technology / Dust Networks
Q. Wang Q. Wang
Univ. of Sci. and Tech. Beijing Univ. of Sci. and Tech. Beijing
March 10, 2013 July 15, 2013
Terminology in IPv6 over Time Slotted Channel Hopping Terminology in IPv6 over Timeslotted Channel Hopping
draft-palattella-6tsch-terminology-00 draft-palattella-6tsch-terminology-01
Abstract Abstract
6TSCH proposes an architecture for an IPv6 multilink subnet that is 6TSCH proposes an architecture for an IPv6 multilink subnet that is
composed of a high speed powered backbone and a number of composed of a high speed powered backbone and a number of
IEEE802.15.4e TSCH wireless networks attached and synchronized by IEEE802.15.4e TSCH wireless networks attached and synchronized by
backbone routers. This document extends existing terminology backbone routers. This document extends existing terminology
documents available for Low-power and Lossy Networks to provide documents available for Low-power and Lossy Networks to provide
additional terminology elements. additional terminology elements.
skipping to change at page 1, line 47 skipping to change at page 1, line 47
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This Internet-Draft will expire on September 11, 2013. This Internet-Draft will expire on January 16, 2014.
Copyright Notice Copyright Notice
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Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
4. Security Considerations . . . . . . . . . . . . . . . . . . . 6 4. Security Considerations . . . . . . . . . . . . . . . . . . . 8
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 8
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 6 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1. Normative References . . . . . . . . . . . . . . . . . . 6 6.1. Normative References . . . . . . . . . . . . . . . . . . 8
6.2. Informative References . . . . . . . . . . . . . . . . . 6 6.2. Informative References . . . . . . . . . . . . . . . . . 8
6.3. External Informative References . . . . . . . . . . . . . 7 6.3. External Informative References . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction 1. Introduction
A new breed of Time Sensitive Networks is being developped to enable A new breed of Time Sensitive Networks is being developed to enable
traffic that is highly sensitive to jitter and quite sensitive to traffic that is highly sensitive to jitter and quite sensitive to
latency. Such traffic is not limited to voice and video, but also latency. Such traffic is not limited to voice and video, but also
includes command and control operations such as found in industrial includes command and control operations such as in industrial
automation or in-vehicule sensors and actuators. automation or in-vehicle sensors and actuators.
At IEEE802.1, the "Audio/Video Task Group", was rename TSN for Time At IEEE802.1, the "Audio/Video Task Group", was renamed TSN for Time
Sensitive Networking. The IEEE802.15.4 Medium Access Control (MAC) Sensitive Networking. The IEEE802.15.4 Medium Access Control (MAC)
has evolved with IEEE802.15.4e which provides in particular the Time has evolved with IEEE802.15.4e which provides in particular the Time
Slotted Channel Hopping (TSCH) mode for industrial-type applications. Slotted Channel Hopping (TSCH) mode for industrial-type applications.
Both provide Deterministic capabities to the point that a packet that Both provide deterministic capabilities to the point that a packet
pertains to a certain flow crosses the network from node to node that pertains to a certain flow crosses the network from node to node
following a very precise schedule, like a train leaves intermediate following a very precise schedule, like a train leaves intermediate
stations at precise times along its path. stations at precise times along its path.
This document provides additional terminology elements to cover terms This document provides additional terminology elements to cover terms
that are new to the context of TSCH wireless networks and other that are new to the context of TSCH wireless networks and other
deterministic networks. deterministic networks.
2. Terminology 2. Terminology
The draft extends [I-D.ietf-roll-terminology] which is included here The draft extends [I-D.ietf-roll-terminology] which is included here
by reference. by reference.
The draft does not reuse terms from IEEE802.15.4e such as "path" or The draft does not reuse terms from IEEE802.15.4e such as "path" or
"link" which bear a meaning that is quite different from classical "link" which bear a meaning that is quite different from classical
IETF parlance. IETF parlance.
This document adds the following terms: This document adds the following terms:
6TSCH: Entity that sets up the schedule, controls the 6TSCH: IPv6 over Time Slotted Channel Hopping (pronounced
connectivity graph of the network, and the resources "sixtus"). It defines a set of IETF sublayers and
allocated to each scheduled cell in that connectivity protocols (in particular, for setting up a schedule with
graph. It may be an adaptation layer, a distributed a centralized or distributed approach, managing the
reservation protocol, a centralized path computation resource allocation), as well as the architecture to bind
entity, or any combination thereof. them together, for use in IPv6 TSCH based networks.
6tus: 6tus (pronounced "sixtus") is the adaptation layer 6F: IPv6 Forwarding. One of the three forwarding model
between TSCH and upper layers like 6LoWPAN and RPL. It supported by 6TSCH. Packets are routed at layer 3, where
is defined in [I-D.draft-wang-6tsch-6tus]. QoS and RED operations are expected to prioritize flows
with differentiated services.
6tus Data Convey Model: Model describing how the 6tus adaptation 6top: 6top is the adaptation layer between TSCH and upper
layers like 6LoWPAN and RPL. It is defined in
[I-D.draft-wang-6tsch-6top].
6top Data Convey Model: Model describing how the 6top adaptation
layer feeds the data flow coming from upper layers into layer feeds the data flow coming from upper layers into
TSCH. It is composed by an I-MUX module, a MUX module, a TSCH. It is composed by an I-MUX module, a MUX module, a
set of priority queues, and a PDU (Payload Data Unit). set of priority queues, and a PDU (Payload Data Unit).
ASN: Absolute Slot Number, the timeslot counter, incremented ASN: Absolute Slot Number, the timeslot counter, incremented
by one at each timeslot. It is wide enough to not roll by one at each timeslot. It is wide enough to not roll
over in practice. See over in practice. See
[I-D.watteyne-6tsch-tsch-lln-context]. [I-D.watteyne-6tsch-tsch-lln-context].
Blacklisting: Set of frequencies which should not be used for Blacklist: Set of frequencies which should not be used for
communication. communication.
Bundle: A group of equivalent scheduled cells, i.e. cells BBR: Backbone Router. In the 6TSCH architecture, it is an LBR
identified by different (slotOffset, channelOffset), and also a NEAR. It performs ND proxy operations between
registered devices and classical ND devices that are
located over the backbone.
Bundle: A group of equivalent scheduled cells, i.e. cells
identified by different [slotOffset, channelOffset],
which are scheduled for a same purpose, with the same which are scheduled for a same purpose, with the same
neighbor, with the same flags, and the same slotframe. neighbor, with the same flags, and the same slotframe.
The size of the bundle refers to the number of cells it The size of the bundle refers to the number of cells it
contains. Given the length of the slotframe, the size of contains. Given the length of the slotframe, the size of
the bundle translates directly into bandwidth, either the bundle translates directly into bandwidth, either
logical, or physical. logical, or physical.
Cell: A single element in the TSCH schedule, identified by a Cell: A single element in the TSCH sloframe, identified by a
slotOffset and a channelOffset value. A cell can be slotOffset value, a channelOffset value, a slotframe_ID
scheduled or unscheduled. During an unscheduled cell, and Hopping_Sequence_ID. A cell can be scheduled or
the node does not communicate. When a cell is scheduled, unscheduled. During an unscheduled cell, the node does
it is assigned a MAC-layer slotframe identifier, a not communicate. When a cell is scheduled, it is
neighbor MAC address (which can be the broadcast assigned a MAC-layer slotframe identifier, a neighbor MAC
address), and one or more of the following flags: TX, RX, address (which can be the broadcast address), and one or
shared, timeskeeping, hard. A broadcast cell is an alias more of the following flags: TX, RX, shared,
for "a scheduled cell with neighbor address the broadcast timeskeeping, hard. A broadcast cell is an alias for "a
scheduled cell with neighbor address the broadcast
address". address".
ChannelOffset: Identifies a row in the TSCH schedule. The number of ChannelOffset: Identifies a row in the TSCH slotframe. The number
available channelOffsets is equal to the number of of available channelOffsets is equal to the number of
available frequencies. The channelOffset translates into available frequencies. The channelOffset translates into
a frequency when the communication takes place, resulting a frequency when the communication takes place, resulting
in channel hopping, as detailed in in channel hopping, as detailed in
[I-D.watteyne-6tsch-tsch-lln-context]. [I-D.watteyne-6tsch-tsch-lln-context].
Dedicated Cell: A cell that is reserved for a given node to transmit Dedicated Cell: A cell that is reserved for a given node to transmit
to a specific neigbor. to a specific neighbor.
Distributed cell reservation: A reservation of a cell done by one or Distributed cell reservation: A reservation of a cell done by one or
more in-network entities (typically a connection more in-network entities (typically a connection
endpoint). endpoint).
Distributed track reservation: A reservation of a track done by one Distributed track reservation: A reservation of a track done by one
or more in-network entities (typically a connection or more in-network entities (typically a connection
endpoint). endpoint).
EB: Enhanced Beacon frame used by an avertising node to EB: Enhanced Beacon frame used by an advertising node to
announce the presence of the network. It contains announce the presence of the network. It contains
information about timeslot length, current ASN value, information about the timeslot length, the current ASN
slotframes and timeslots the beaconing mote is listening value, the slotframes and timeslots the beaconing mote is
on, and a 1-byte join priority (i.e., number of hops listening on, and a 1-byte join priority (i.e., number of
separating the node sending the EB, and the PAN hops separating the node sending the EB, and the PAN
coordinator). coordinator).
FF: 6LoWPAN Fragment Forwarding. It is one of the three
forwarding model supported by 6TSCH. The 6LoWPAN
Fragment is used as a label for switching at the 6LoWPAN
sublayer, as defined in
[I-D.thubert-roll-forwarding-frags].
GMPLS: Generalized Multi-Protocol Label Switching, a 2.5 layer GMPLS: Generalized Multi-Protocol Label Switching, a 2.5 layer
service that is used to forward packets based on the service that is used to forward packets based on the
concept of generalized labels. concept of generalized labels.
Hard Cell: A scheduled cell that is locked, i.e., it cannot be moved Hard Cell: A scheduled cell that is locked, i.e., it cannot be moved
by 6tus in the schedule. See by 6top in the schedule. See
[I-D.draft-wang-6tsch-6tus]. [I-D.draft-wang-6tsch-6top].
Hopping Sequence: Sequence of frequencies, identified by a
Hopping_Sequence_ID, used for channel hopping, when
translating the channel offset value into a frequency
(i.e., PHY channel). See
[I-D.watteyne-6tsch-tsch-lln-context].
IE: Information Elements, a list of Type-Length-Value IE: Information Elements, a list of Type-Length-Value
containers placed at the end of the MAC header, used to containers placed at the end of the MAC header, used to
pass data between layers or devices. A small number of pass data between layers or devices. A small number of
types are defined by TSCH, but a range of types is types are defined by TSCH, but a range of types is
available for extensions, and thus, is exploitable by available for extensions, and thus, is exploitable by
6TSCH. See [I-D.watteyne-6tsch-tsch-lln-context]. 6TSCH. See [I-D.watteyne-6tsch-tsch-lln-context].
I-MUX module: Inverse-Multiplexer, a classifier that receives I-MUX module: Inverse-Multiplexer, a classifier that receives
6LoWPAN frames and places them into priority queues. 6LoWPAN frames and places them into priority queues.
Logical Cell: A cell that correspond to granted bandwidth but is KMP: Key Managment Protocol.
LBR: LLN Border Router. It is an LLN device, usually powered,
that acts as a Border Router to the outside within the
6TSCH architecture.
Link: A communication facility or medium over which nodes can
communicate at the link layer, i.e., the layer
immediately below IP. Thus, the IETF parlance for the
term "Link" is adopted, as opposed to the incompatible
IEEE802.15.4e terminology. In the context of the 6TSCH
architecture, which applies to Low Power Lossy Networks
(LLNs), an IPv6 subnet is usually not congruent to a
single link and techniques such as IPv6 Neighbor
Discovery Proxying and Routing Over LLNs are required to
achieve reachability within the multilink subnet. A link
is distinct from a track. In fact, link local addresses
are not expected to be used over a track for end to end
communication. Finally, from the Layer 3 perspective
(where the inner complexities of TSCH operations are
hidden to enable classical IP routing and Forwarding), a
single radio interface may be seen as a number of Links
with different capabilities for unicast or multicast
services.
Logical Cell: A cell that corresponds to granted bandwidth but is
only lazily associated to a physical cell, based on only lazily associated to a physical cell, based on
usage. usage.
MAC: Medium Access Control.
MUX module: Multiplexer, the entity that dequeues frames from MUX module: Multiplexer, the entity that dequeues frames from
priority queues and associates them to a cell for priority queues and associates them to a cell for
transmission. transmission.
PCE: Path Computation Entity, the entity in the network which NEAR: Energy Aware Default Router, as defined in
[I-D.chakrabarti-nordmark-6man-efficient-nd].
PANA: Protocol for carrying Authentication for Network Access,
as defined in [RFC5191] . It is the protocol used in the
6TSCH architecture for handling authentication during the
join process.
PCE: Path Computation Element, the entity in the network which
is responsible for building and maintaining the TSCH is responsible for building and maintaining the TSCH
schedule, when centralized scheduling is used. schedule, when centralized scheduling is used.
PCE cell reservation: The reservation of a cell done by the PCE. PCE cell reservation: The reservation of a cell done by the PCE.
PCE track reservation: The reservation of a track done by the PCE. PCE track reservation: The reservation of a track done by the PCE.
Provisioned Cell: A soft cell which provides redundancy above the
required bandwidth to ensure some QoS level.
QoS: Quality of Service. QoS: Quality of Service.
Shared Cell: A cell that is used by transmitted nodes at the same SA: Security Association.
time and on the same channelOffset. Only cells with TX
flag can be marked as "shared". A backoff algorithm is
used to resolve contention.
SlotOffset: Identifies a column in the TSCH schedule, i.e. the Shared Cell: A cell that is used by more than one transmitter nodes
at the same time and on the same channelOffset. Only
cells with TX flag can be marked as "shared". A backoff
algorithm is used to resolve contention.
SlotOffset: Identifies a column in the TSCH schedule, i.e., the
number of timeslots since the beginning of the current number of timeslots since the beginning of the current
iteration of the slotframe. iteration of the slotframe.
Slotframe: A MAC-level abstraction that is internal to the node and Slotframe: A MAC-level abstraction that is internal to the node and
contains a series of timeslots of equal length and contains a series of timeslots of equal length and
priority. Multiple slotframes can coexist in a node's priority. It is characterized by a slotframe_ID, and a
schedule, i.e., a node can have multiple activities slotframe_size. Multiple slotframes can coexist in a
scheduled in different slotframes, based on the priority node's schedule, i.e., a node can have multiple
of its packets/traffic flows. The timeslots in the activities scheduled in different slotframes, based on
Slotframe are indexed by the SlotOffset; the first the priority of its packets/traffic flows. The timeslots
in the Slotframe are indexed by the SlotOffset; the first
timeslot is at SlotOffset 0. timeslot is at SlotOffset 0.
Soft Cell: A scheduled cell that is not locked, i.e., it may be Soft Cell: A scheduled cell that is not locked, i.e., it may be
moved in the schedule within a same slotframe by 6tus moved in the schedule within a same slotframe by 6top, as
[I-D.draft-wang-6tsch-6tus]. described in [I-D.draft-wang-6tsch-6top].
TF: Track Forwarding. It is the simplest and fastest
forwarding model supported by 6TSCH. It is a G-MPLS-like
forwarding model. The input cell characterises the flow
and indicates the output cell.
Timeslot: A basic communication unit in TSCH which allows a Timeslot: A basic communication unit in TSCH which allows a
transmitter node to send a frame to a receiver neighbor, transmitter node to send a frame to a receiver neighbor,
and that receiver neighbor to optionally send back an and that receiver neighbor to optionally send back an
acknowledgment. The length of the timeslot determines acknowledgment. The length of the timeslot determines
the maximum size of the frame and the number of the maximum size of the frame that can be exchanged.
acknowledgements (in case multiple are used, e.g.,
duocast), that can be exchanged.
Time Source Neighbor: A neighbor a node uses as its time reference, Time Source Neighbor: A neighbor a node uses as its time reference,
and to which it needs to keep its clock synchronized. A and to which it needs to keep its clock synchronized. A
node can have one or more time source neighbors. node can have one or more time source neighbors.
Track: A determined sequence of cells along a multi-hop path. Track: A determined sequence of cells along a multi-hop path.
This is typically the result of a reservation. It is typically the result of a reservation. The node
that initializes the process for establishing a track is
the owner of the track. The latter assigns a unique
identifier to the track, called TrackID.
TrackID: Unique identifier of a track, assigned by the owner of
the track.
TSCH: Time Slotted Channel Hopping, a medium access mode of the TSCH: Time Slotted Channel Hopping, a medium access mode of the
[IEEE802154e] standard which uses time synchronization to [IEEE802154e] standard which uses time synchronization to
achieve ultra low-power operation and channel hopping to achieve ultra low-power operation and channel hopping to
enable high reliability. enable high reliability.
TSCH Schedule: A matrix of cells, each cells indexed by a slotOffset TSCH Schedule: A matrix of cells, each cell indexed by a slotOffset
and a channelOffset. The slotframe size (the "width" of and a channelOffset. The slotframe size (the "width" of
the matrix) is the number of timeslots it contains. The the matrix) is the number of timeslots it contains. The
number of channelOffset values (the "height" of the number of channelOffset values (the "height" of the
matrix) is equal to the number of available frequencies. matrix) is equal to the number of available frequencies.
The TSCH schedule contains all the scheduled cells from The TSCH schedule contains all the scheduled cells from
all slotframes and is sufficient to qualify the all slotframes and is sufficient to qualify the
communication in the TSCH network. communication in the TSCH network.
3. IANA Considerations 3. IANA Considerations
This specification does not require IANA action. This specification does not require IANA action.
4. Security Considerations 4. Security Considerations
This specification is not found to introduce new security threat. This specification is not found to introduce new security threat.
5. Acknowledgements 5. Acknowledgements
Thanks to the IoT6 European Project (STREP) of the 7th Framework
Program (Grant 288445).
6. References 6. References
6.1. Normative References 6.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997. Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC5191] Forsberg, D., Ohba, Y., Patil, B., Tschofenig, H., and A.
Yegin, "Protocol for Carrying Authentication for Network
Access (PANA)", RFC 5191, May 2008.
6.2. Informative References 6.2. Informative References
[I-D.draft-thubert-6tsch-architecture] [I-D.chakrabarti-nordmark-6man-efficient-nd]
Thubert, P., Ed., Assimiti, R., and T. Watteyne, "An Chakrabarti, S., Nordmark, E., and M. Wasserman,
Architecture for IPv6 over Time Synchronized Channel "Efficiency aware IPv6 Neighbor Discovery Optimizations",
Hopping. draft-thubert-6tsch-architecture-00 (work in draft-chakrabarti-nordmark-6man-efficient-nd-01 (work in
progress) ", March 2013. progress), November 2012.
[I-D.draft-wang-6tsch-6tus] [I-D.draft-wang-6tsch-6top]
Wang, Q., Ed., Vilajosana, X., and T. Watteyne, "6tus Wang, Q., Ed., Vilajosana, X., and T. Watteyne, "6TSCH
Adaptation Layer Specification. draft-wang-6tsch-6tus-00 Operation Sublayer (6top). draft-wang-6tsch-6top-00 (work
(work in progress) ", March 2013. in progress) ", July 2013.
[I-D.ietf-roll-terminology] [I-D.ietf-roll-terminology]
Vasseur, J., "Terminology in Low power And Lossy Vasseur, J., "Terminology in Low power And Lossy
Networks", draft-ietf-roll-terminology-11 (work in Networks", draft-ietf-roll-terminology-12 (work in
progress), March 2013.
[I-D.ohba-6tsch-security]
Chasko, S., Das, S., Lopez, R., Ohba, Y., Thubert, P., and
A. Yegin, "Security Framework and Key Management Protocol
Requirements for 6TSCH", draft-ohba-6tsch-security-01
(work in progress), July 2013.
[I-D.thubert-6tsch-architecture]
Thubert, P., Assimiti, R., and T. Watteyne, "An
Architecture for IPv6 over Time Slotted Channel Hopping",
draft-thubert-6tsch-architecture-01 (work in progress),
April 2013.
[I-D.thubert-roll-forwarding-frags]
Thubert, P. and J. Hui, "LLN Fragment Forwarding and
Recovery", draft-thubert-roll-forwarding-frags-01 (work in
progress), February 2013. progress), February 2013.
[I-D.vilajosana-6tsch-basic]
Vilajosana, X. and K. Pister, "Minimal 6TSCH
Configuration", draft-vilajosana-6tsch-basic-01 (work in
progress), July 2013.
[I-D.watteyne-6tsch-tsch-lln-context] [I-D.watteyne-6tsch-tsch-lln-context]
Watteyne, T., "Using IEEE802.15.4e TSCH in an LLN context: Watteyne, T., Palattella, M., and L. Grieco, "Using
Overview, Problem Statement and Goals", draft-watteyne- IEEE802.15.4e TSCH in an LLN context: Overview, Problem
6tsch-tsch-lln-context-01 (work in progress), February Statement and Goals", draft-watteyne-6tsch-tsch-lln-
2013. context-02 (work in progress), May 2013.
6.3. External Informative References 6.3. External Informative References
[IEEE802154e] [IEEE802154e]
IEEE standard for Information Technology, "IEEE std. IEEE standard for Information Technology, "IEEE std.
802.15.4e, Part. 15.4: Low-Rate Wireless Personal Area 802.15.4e, Part. 15.4: Low-Rate Wireless Personal Area
Networks (LR-WPANs) Amendament 1: MAC sublayer", April Networks (LR-WPANs) Amendament 1: MAC sublayer", April
2012. 2012.
Authors' Addresses Authors' Addresses
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