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Reporter: rbarnes@bbn.com | Owner: jmpolk@cisco.com
Type: defect | Status: new
Priority: major | Milestone: draft-ietf-geopriv-3825bis
Component: rfc3825bis | Version:
Severity: - | Resolution:
Keywords: |
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Comment(by bernard_aboba@hotmail.com):
Here is what Section 1.2 currently looks like:
1.2. Resolution and Uncertainty
The DHCPv4 option format defined in this document utilizes both
resolution and uncertainty parameters. The DHCPv6 option format only
utilizes an uncertainty parameter.
Version 0 of the DHCPv4 option format defined in this document
includes a resolution parameter for each of the dimensions of
location. Since this resolution parameter need not apply to all
dimensions equally, a resolution value is included for each of the 3
location elements. Resolution does not define Geographic Privacy
policy.
Appendix A of this document provides some arithmetic examples of the
implication of different resolution values on the La/Lo/Alt.
The DHCPv6 option format as well as version 1 of the DHCPv4 option
format utilizes an uncertainty parameter. In the context of location
technology, uncertainty is a quantification of errors. Any method
for determining location is subject to some sources of error;
uncertainty describes the amount of error that is present.
Uncertainty might be the coverage area of a wireless transmitter, the
extent of a building or a single room.
Uncertainty is usually represented as an area within which the target
is located. In this document, each of the three axes can be assigned
an uncertainty value. In effect, this describes a rectangular prism.
When representing locations from sources that can quantify
uncertainty, the goal is to find the smallest possible rectangular
prism that this format can describe. This is achieved by taking the
minimum and maximum values on each axis and ensuring that the final
encoding covers these points. This increases the region of
uncertainty, but ensures that the region that is described
encompasses the target location.
Comments?
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Ticket URL: <http://trac.tools.ietf.org/wg/geopriv/trac/ticket/4#comment:6>
geopriv <http://tools.ietf.org/geopriv/>
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