LTP5901-IPM datasheet(3/36 Pages) LINER

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LTP5901-IPM/LTP5902-IPM

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sMarTMesh neTwork overview

The Network Manager uses health reports to continually

optimize the network to maintain >99.999% data reliability

even in the most challenging RF environments.

The use of TSCH allows SmartMesh devices to sleep in

between scheduled communications and draw very little

power in this state. Motes are only active in time slots

where they are scheduled to transmit or receive, typically

resulting in a duty cycle of < 1%. The optimization soft-

ware in the Network Manager coordinates this schedule

automatically. When combined with the Eterna low power

radio, every mote in a SmartMesh network—even busy

routing ones—can run on batteries for years. By default,

all motes in a network are capable of routing traffic from

other motes, which simplifies installation by avoiding the

complexity of having distinct routers vs non-routing end

nodes. Motes may be configured as non-routing to further

reduce that particular mote’s power consumption and to

support a wide variety of network topologies.

ASmartMeshnetworkconsistsofaself-formingmulti-hop

mesh of nodes, known as motes, which collect and relay

data, and a network manager that monitors and manages

network performance and security, and exchanges data

with a host application.

SmartMesh networks communicate using a time slotted

channel hopping (TSCH) link layer, pioneered by Dust

Networks. In a TSCH network, all motes in the network

are synchronized to within less than a millisecond. Time

in the network is organized into time slots, which enables

collision-free packet exchange and per-transmission

channel-hopping. In a SmartMesh network, every device

has one or more parents (e.g. mote 3 has motes 1 and

2 as parents) that provide redundant paths to overcome

communicationsinterruptionduetointerference,physical

obstruction or multi-path fading. If a packet transmission

fails on one path, the next retransmission may try on a

different path and different RF channel.

A network begins to form when the network manager

instructs its on-board Access Point (AP) radio to begin

sending advertisements—packetsthatcontaininformation

that enables a device to synchronize to the network and

request to join. This message exchange is part of the secu-

rity handshakethatestablishesencryptedcommunications

betweenthemanagerorapplication,andmote.Oncemotes

have joined the network, they maintain synchronization

through time corrections when a packet is acknowledged.

At the heart of SmartMesh motes and network manag-

ers is the Eterna IEEE 802.15.4e System-on-Chip (SoC),

featuring Dust Networks’ highly integrated, low power

radio design, plus an ARM Cortex-M3 32-bit micropro-

cessor running SmartMesh networking software. The

SmartMesh networking software comes fully compiled

yet is configurable via a rich set of Application Program-

ming Interfaces (APIs) which allows a host application

to interact with the network, e.g. to transfer information

to a device, to configure data publishing rates on one or

more motes, or to monitor network state or performance

metrics. Data publishing can be uniform or different for

each device, with motes being able to publish infrequently

or faster than once per second as needed.

An ongoing discovery process ensures that the network

continually discovers new paths as the RF conditions

change. In addition, each mote in the network tracks per-

formance statistics (e.g. quality of used paths, and lists of

potential paths) and periodically sends that information

to the network manager in packets called health reports.

ALL NODES ARE ROUTERS.

THEY CAN TRANSMIT AND RECEIVE.

THIS NEW NODE CAN JOIN

ANYWHERE BECAUSE ALL

NODES CAN ROUTE.

SNO 02

HOST

APPLICATION

SNO 01

NETWORK MANAGER

Mote

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