Problem with interpreting "frequencyRanges" in AVAIL_SPECTRUM_REQ

[Przemysław Pawełczak]

Dear Mike,

Another quick question from our side. 

I'm confused as to how interpret Google WSDB reply when passing "capabilities": { "frequencyRanges": []}" in AVAIL_SPECTRUM_REQ request.

Despite asking Google Server to give frequencies only for:

"frequencyRanges": [{ "startHz": 800000000, "stopHz": 850000000 }, { "startHz": 900000000, "stopHz": 950000000 }]

Server replies with channels outside of these ranges:

{

        "startHz": 5.4E7,

        "stopHz": 6.62E8,

        "maxPowerDBm": -56.799999947335436

       },

       {

        "startHz": 6.62E8,

        "stopHz": 6.68E8,

        "maxPowerDBm": 15.99999928972511

       },

You can actually see it in the example on https://developers.google.com/spectrum/paws/gettingstarted#familiarize

Its this a bug, a valid server reply, or we are missing something here?

Best regards,

Przemek

[Michael Head]

You're right. This is a bug.

We don't apply frequencyRanges mask over the results. PAWS says we "SHOULD NOT" return spectrum outside those ranges, but the current implementation does anyway.

It's unlikely that we'll change this in the current PAWS draft 06 implementation. It's possible -- even likely -- that we will fix when we migrate our API to the final PAWS RFC (once it's ratified by IETF).

-- mike

[Przemysław Pawełczak]

Thanks Mike! All clear now.

Cheers,

Przemek