[Lwip] Interoperable sub-GHz implementations
Charles Palmer <charles.palmer@acutetechnology.com> Sun, 31 March 2013 13:42 UTC
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Date: Sun, 31 Mar 2013 14:42:02 +0100
From: Charles Palmer <charles.palmer@acutetechnology.com>
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Subject: [Lwip] Interoperable sub-GHz implementations
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Dear all I suggested adding a mention of regulatory constraints in the draft-ietf-lwig-terminology-03. For example in Europe ETSI standard EN 300 220-1 imposes duty cycle constraints on operation in the 873-870MHz band. As it happens this is a practical concern of the UK smart meter programme. They are considering the merits of sub-GHz operation but are concerned about violating the duty cycle constraints, which are 1% or 0.1% depending on frequency. Apparently the new IEEE 802.15.4g PHY options are written around US regulations and may not map onto European constraints where duty cycle must be met. This happens to be an interest of mine: how to get the improved range of the 863-870MHz band (vs a vis 2.4GHz) while still adhering to IEEE standards and not violating power and duty cycle regulations. It would be possible to select a combination of PHY parameters from IEEE 802.15.4g and one or other MAC implementation (e.g. from 802.15.4e) to produce workable solutions for low power wireless networks, but without coordination that riases the likelihood of a proliferation of standards-compliant implementations such that offerings from different suppliers will not interoperate. One appoach might be to keep an eye on what the UK smart meter programme is doing, and follow that, but their progress is very slow, and they seem to be interested in providing just a new PHY and MAC on which to operate Zigbee SE1.x. Perhaps there are others in this group who have thoughts on this, or knowledge of current or future implementations? -- Regards - Charles Palmer Project Hydra Project Manager - Acute Technology Limited Woodthorpe, Calver Road, Baslow, Derbyshire, DE45 1RR, United Kingdom Mob: +44 (0)7977 577 627 Skype: Acutetech Email: charles.palmer@acutetechnology.com Web: http://projecthydra.info
- [Lwip] Interoperable sub-GHz implementations Charles Palmer