http://www.wimax.com/commentary/blog/blog-2009/may-2009/introducing-private-mobile-wimax-0524

1. Smart Grid Debate: Licensed vs. Unlicensed Wireless Spectrum

Increasingly, utilities and companies are deciding whether smart grid wireless networks need to run over licensed wireless spectrum, in which the airwaves are owned and regulated or unlicensed, which is shared spectrum and can be used by anyone as long as they abide by certain rules. With utilities spending billions on smart grid networks, the choice could determine which tech companies that plan to sell smart grid gear to the utilities are successful and which are not.

The degree of reliability and security that a smart grid demands can only be achieved with licensed spectrum, its backers argue. The idea is that because licensed spectrum is owned by one entity and can be used for a single purpose its users won’t face interference. But the problem is that licenses to buy spectrum cost money adding substantial fees to smart grid rollouts. On the other hand because unlicensed spectrum is shared and doesn’t require an expensive license to access it, its backers believe it’s the only option cheap enough to offer utilities a cost-effective method to roll out meter projects. But critics say that because unlicensed spectrum is shared by many users, services deployed on those networks can face interference.

We recently learned of the debate from Stewart Kantor, the CEO and founder of Full Spectrum, a two-year-old startup that builds WiMAX-based wireless networking gear that runs over licensed spectrum. His company sells WiMAX-based radios (which add intelligence to the power grid where power is distributed from generation to substation) that run over licensed, ultra-high frequency and very high frequency spectrum. He told us unlicensed wireless services are “problematic” for mission-critical services, which need to be secure, reliable and robust.

http://www.reuters.com/article/earthToTech/idUS147059551820090505
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2. WiMAX and the grid

Smart grid technology is a business play, not a consumer play. The ability of spies to get into the existing grid is due to the fact current “smart grid” plans maintain a connection to the current Internet. This is a critical weakness that policymakers can fix.

The solution is very simple. Designate a narrow band of frequency to wireless electrical infrastructure. Close that network off from the Internet. Require radios using that frequency to be certified, and limit their functions. Have control functions centrally licensed.

Taking WiMAX, as it is, into the smart grid business is overkill. The data load on a smart grid network should not be enormous. A sectorized, cellular-like solution should not require wide bandwidth to work. All you’re delivering is simple data on loads and availability of power.

A small slice of existing ISM bands should be sufficient to do the job, regardless of the underlying technology. Regardless of how smart grid data is encoded, it’s more important that the technology it uses be ubiquitous and isolated than wideband.

http://blogs.zdnet.com/open-source/?p=4163