All,
At the F2F, it was agreed that allowing slopes to be encoded in the
available-spectrum response is acceptable if:
- It is not required
- It is used to represent the "availability mask" and NOT any
"transmission masks"
There was some concern about the point-wise representation.
It turns out that the IEEE 1900.5 working group for "Dynamic Spectrum
Access Network" has also been working on data models, and their data
models does use (frequency, power) point-wise representation for
spectrum masks.
So, in the interest of remaining aligned, I'm including proposed text that
uses the point-wise representation.
It is a rather long excerpt, but hopefully it provides a complete picture.
--
-vince
----------------------------
5.11. Spectrum
Available spectrum can be characterized by an ordered list of
spectrum profiles that defines permissible power levels over a set of
frequency ranges. Each Spectrum element defines permissible power
levels as maximum power spectral densities over a specified
resolution bandwidth, "psdBandwidthHz". Note that the spectrum
profiles represent the "availability mask", as defined by the
governing rule set; they are not intended to encode device-level
transmission-mask requirements.
o To support regulatory rules that define different "wide-band" and
"narrow-band" power levels, PAWS allows multiple Spectrum elements
to be included in the available-spectrum response, each with a
different resolution bandwidth.
o When multiple Spectrum elements are included in the response, they
represent a logical AND condition, such that the Device MUST
satisfy all the conditions.
o Each Spectrum element MUST cover the range of frequencies governed
by a ruleset, rather than splitting the frequencies across
multiple Spectrum elements for the same resolution bandwidth.
o Each spectrum profile represents the maximum permissible power
spectral density over a contiguous range of frequencies.
o When multiple spectrum profiles are included, they MUST be
disjoint and SHOULD be ordered in non-decreasing frequency value.
o Gaps in frequencies between consecutive spectrum profiles
represent unavailability for those frequencies.
The following figure illustrates the Spectrum element and the
SpectrumProfile list.
+-------------------------------+
|Spectrum |
+---------------------+---------+
|psdBandwidthHz:float |required |
|profiles:list |required |---+
+---------------------+---------+ | 0..*
V
+-----------------------------+
|SpectrumProfile |
+-------------------+---------+
|points:list |required |
+-------------------+---------+
|
V 2..*
+------------------------------+
|freqHz:float |required |
|powerDbmPerBw:float |required |
+--------------------+---------+
Parameters:
psdBandwidthHz: This parameter is REQUIRED to define the resolution
bandwidth (in Hertz) over which permissible power spectral density
is defined. For example, FCC regulation would require one
spectrum specification at a bandwidth of 6MHz, and ETSI regulation
would require two specifications, at 0.1MHz and 8MHz. This
parameter MAY be empty if there is no available spectrum.
profiles: A SpectrumProfile (Section 5.12) list is REQUIRED to
specify permissible power levels over a set of frequency ranges.
The list MAY be empty if there is no available spectrum.
Consider the following example with different permitted power
spectral densities for the same set of frequencies over different
resolution bandwidths (for illustrative purposes only):
[
"spectrum": {
"psdBandwidthHz": 6e6,
"profiles": [
[
{"freqHz": 5.18e8, "powerDbmPerBw": 30.0},
{"freqHz": 5.24e8, "powerDbmPerBw": 30.0},
],
...
]
},
"spectrum": {
"psdBandwidthHz": 1e5,
"profiles": [
[
{"freqHz": 5.18e8, "powerDbmPerBw": 27.0},
{"freqHz": 5.24e8, "powerDbmPerBw": 27.0},
],
...
]
}
]
This is interpreted as:
o Over any 6MHz within the frequency range, [518MHz, 524MHz),
maximum permitted power is 30.0dBm (1000mW), and
o Over any 100 kHz within the frequency range, [518MHz, 524MHz),
maximum permitted power is 27.0dBm (500mW)
This would allow, for example, operating two 100kHz sub-channels
within the indicated 6MHz range at 500mW each, totaling 1000mW. Of
course, many combinations are possible, as long as they satisfy both
conditions.
The following example illustrates multiple spectrum profiles that has
a gap from 530 MHz to 536 MHz:
[
"spectrum": {
"psdBandwidthHz": 6e6,
"profiles": [
[
{"freqHz": 5.18e8, "powerDbmPerBw": 30.0},
{"freqHz": 5.24e8, "powerDbmPerBw": 30.0},
{"freqHz": 5.24e8, "powerDbmPerBw": 36.0},
{"freqHz": 5.30e8, "powerDbmPerBw": 36.0},
],
[
{"freqHz": 5.36e8, "powerDbmPerBw": 30.0},
{"freqHz": 5.42e8, "powerDbmPerBw": 30.0},
],
...
]
},
"spectrum": {
"psdBandwidthHz": 1e5,
"profiles": [
[
{"freqHz": 5.18e8, "powerDbmPerBw": 27.0},
{"freqHz": 5.24e8, "powerDbmPerBw": 27.0},
{"freqHz": 5.24e8, "powerDbmPerBw": 30.0},
{"freqHz": 5.30e8, "powerDbmPerBw": 30.0},
],
[
{"freqHz": 5.36e8, "powerDbmPerBw": 27.0},
{"freqHz": 5.42e8, "powerDbmPerBw": 27.0},
],
...
]
}
]
5.12. SpectrumProfile
A spectrum profile is characterized by an ordered list of (frequency,
power) points that represents the shape of maximum permissible power
levels over a range of frequencies.
o It MUST contain a minimum of two entries.
o The entries in the list MUST be ordered in non-decreasing
frequency values.
o Two consecutive points MAY have the same frequency value to
represent a "step function".
o Three or more points MAY NOT share the same frequency value.
o The first frequency is inclusive; the last frequency is exclusive.
The following figure defines the SpectrumProfile element.
+-------------------------------+
|SpectrumProfile |
+---------------------+---------+
|points:list |required |---+
+---------------------+---------+ | 2..*
V
+------------------------------+
|freqHz:float |required |
|powerDbmPerBw:float |required |
+--------------------+---------+
Parameters of each point in the profile:
freqHz: The frequency, in Hertz, at which the power level is
defined.
powerDbmPerBw: The power level, express as dBm per resolution
bandwidth, as defined by the "psdBandwidthHz" element of the
enclosing Spectrum (Section 5.11) element.
_______________________________________________
paws mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/paws
