LI-PS-PDU: Add LocationContext, Locations

    wlanLocationAttributes          [2] WlanLocationAttributes OPTIONAL,

    eTSI671HI2Location              [3] HI2Operations.Location OPTIONAL,

    threeGPP33128UserLocation       [4] TS33128Payloads.UserLocation OPTIONAL,

    cPEProvidedLocationAttributes [5] CPEProvidedLocationAttributes OPTIONAL

    cPEProvidedLocationAttributes   [5] CPEProvidedLocationAttributes OPTIONAL,

        -- Drafting note:

        -- Normative text to consider for the standard (e.g., in clause 4.5).

        -- If context[6] is provided, all other provided fields in this instance

        -- of Location shall refer to the same location event.

        -- Otherwise, the absence of context[6] makes no guarantees that this

        -- instance of Location is explicitly for a single location event,

        -- for backwards compatibility with older interpretations.

        --

    locationContext                 [6] LocationContext OPTIONAL

}

Locations ::= SEQUENCE OF Location

LocationContext ::= SEQUENCE

{

    source                      [1] LocationSource,

    timeStamp                   [2] GeneralizedTime,

    timeStampQualifier          [3] LocationTimeStampQualifier,

    ...

}

        -- Drafting note:

        -- Can add network-untrusted in the future.

        -- Don't "love" the cPEOrClient name.

        --

LocationSource ::= ENUMERATED

{

    unknown(0),

    network(1),

    cPEOrClient(2),

    ...

}

        -- Drafting note:

        -- Consider if we actually need a specific LocationTimeStampQualifier, versus

        -- just using TimeStampQualifier, possibly with addition of timeLastObserved

        -- to the latter.

        -- It's unclear to Luke that we actually need timeOfCalculation; the concept

        -- seems to be effectively timeOfMediation.

        --

LocationTimeStampQualifier ::= ENUMERATED

{

    unknown(1),

    timeOfInterception(2),

    timeOfMediation(3),

    timeOfCalculation(4),

    timeLastObserved(5)

}

WlanLocationAttributes ::= SEQUENCE