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paws database architecture

paws database architecture. Brian Rosen. Reminder of basic need. Nation independent Spectrum Band independent Phy /Mac independent. Example of how US TV Bands database works. Database is provisioned with a set of “protected entity” records = primary users of spectrum

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paws database architecture

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  1. paws database architecture Brian Rosen

  2. Reminder of basic need • Nation independent • Spectrum Band independent • Phy/Mac independent

  3. Example of how US TV Bands database works • Database is provisioned with a set of “protected entity” records = primary users of spectrum • In the U.S., there are 10 or so kinds of protected entities • While most are transmitters, some are receivers • Records contain location of transmitter/receiver, type of protected entity, …

  4. Contours • For each protected entity, a contour (polygon) is calculated • Typical RF propagation algorithm, which takes into account height of antenna, and height of terrain between transmitter and receiver • A buffer zone is added to this contour • The result is a protected contour, within which white space devices cannot operate • The contour is specific to a channel • For some kinds of protected entities, both co-channel and adjacent channel protection is given

  5. Database query • White Space Devices query the database with it’s location (and in the U.S., type: fixed or personal/portable). • The location of the WSD is intersected with each contour • For any contour which the WSD is within, the associated channel is not available • The list of channels left is returned to the WSD. It can operate on any of them.

  6. Handling Nation Independence • DB discovery has to be location sensitive • Possible use of LoST • Rules for creating contours from protected entity data has to be nation specific

  7. Handling Spectrum Band Independence • Obvious connection to Nation • DB discovery may have to be spectrum dependent • Need a notion of a part of a band = channel, but there may not be formal channels in some bands

  8. Handling Mac/Phy independence • Query is L7 (probably HTTP based) • Query does not have any phy/mac dependence: location + type in, allowed spectrum choices out

  9. Inter-DB sync • In US, multiple competing DBs in TV Bands • Operators of DBs must interchange protected entity data • Each DB computes contours and handles queries • Inter-DB sync protocol will probably be standardized • Currently out of scope for paws

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