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Weightless SIG releases IoT over white space specification

Posted: 09 Apr 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Bluetooth? FDMA? TDD? PAN technologies?

The Weightless SIG has revealed version 1.0 of the pioneering machine communications standard.

The Weightless standard, optimised for machines, claims to offer transformational competitive advantages over legacy technologies in which low cost terminal hardware and license free frequency spectrum provides ground breaking cost savings comparable with PAN technologies such as Bluetooth. Additionally, low power consumption allows operation of battery powered terminals using single primary cells for periods of more than ten years and high quality low frequency spectrum show excellent signal propagation characteristics yielding ubiquitous coverage through superior range and in-building penetration, added Weightless SIG.

At the terminal level data rates from 1kb/s to 10Mb/s are possible depending on link budget with data packet sizes from 10B and no upper limit with an extremely low overhead50B packets have less than 20 per cent overhead. Acknowledged and unacknowledged message transmission modes are supported and multi-cast call capability allows messages to be sent to multiple devices. Interrupt capability allows devices to raise alarms for specific events such as power outage. Service provision layering enables worldwide contracts and automated change of network provider capabilities. Terminals can run multiple applications and mobility is fully supported. An ultra-secure 128bit encryption and authentication model based on a shared secret key is provided. Extremely low complexity terminal architecture enables low cost implementation using minimal memory and processor power to further extend battery life.

At the network level careful scheduling enables transmissions to be planned in advance resulting in very high loading efficiency and both frequency hopping and intelligent frequency planning maximise throughput on congested networks. An extremely wide range of modulation schemes and spreading factors provides flexibility in network design enabling 5km coverage to indoor terminals. The entire core network is run as a software service and can be cloud-hosted. Ultra low out-of-band emissions through waveform shaping maximises white space bandwidth availability and license spectrum significantly reduces network costs.

Modulation methods from 16-QAM to differential BPSK coupled with spreading codes up to 1024 enable an extremely wide range of link budgets to be configured. Downlink single carrier modulation of 6MHz bandwidth and uplink FDMA channels using 16 interweaved channels for the Americas and 8MHz bandwidth downlink and uplink narrowband FDMA channels using 24 parallel 128kb/s channels for rest of the world enables truly global operation. Time Division Duplex (TDD) is used with flexible uplink/downlink boundaries on a frame-by-frame and per base station basis enabling dynamic balancing of uplink and downlink traffic. Error detection and correction with packet re-transmission capability is built in and terminal sleep modes are fully integrated into the system design.





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