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Versions: 00 01 02 03 04 05 06 draft-ietf-geopriv-held-measurements

GEOPRIV                                                       M. Thomson
Internet-Draft                                           J. Winterbottom
Intended status: Standards Track                                  Andrew
Expires: November 9, 2008                                    May 8, 2008


      Using Device-provided Location-Related Measurements in HELD
             draft-thomson-geopriv-held-measurements-02.txt

Status of this Memo

   By submitting this Internet-Draft, each author represents that any
   applicable patent or other IPR claims of which he or she is aware
   have been or will be disclosed, and any of which he or she becomes
   aware will be disclosed, in accordance with Section 6 of BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on November 9, 2008.


















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Abstract

   A method is described by which a Device is able to provide location-
   related measurement data to a LIS within a HELD request.  Location-
   related measurement information are observations concerning
   properties related to the position of a Device, which could be data
   about network attachment or about the physical environment around the
   LIS.  When a LIS generates location information for a device,
   information from the device can improve the accuracy of the location
   estimate.  A basic set of location-related measurements are defined,
   including common modes of network attachment as well as assisted
   Global Navigation Satellite System (GNSS) parameters.


Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Conventions used in this document  . . . . . . . . . . . . . .  5
   3.  Location-Related Measurements in HELD Requests . . . . . . . .  6
   4.  Location-Related Measurement Data Types  . . . . . . . . . . .  7
     4.1.  Common Location-Related Measurement Fields . . . . . . . .  7
       4.1.1.  Time of Measurement  . . . . . . . . . . . . . . . . .  7
       4.1.2.  Expiry Time on Location-Related Measurement Data . . .  7
       4.1.3.  RMS Error and Number of Samples  . . . . . . . . . . .  8
     4.2.  LLDP Measurements  . . . . . . . . . . . . . . . . . . . .  8
     4.3.  DHCP Relay Agent Information Measurements  . . . . . . . .  9
     4.4.  802.11 WLAN Measurements . . . . . . . . . . . . . . . . . 10
     4.5.  Cellular Measurements  . . . . . . . . . . . . . . . . . . 11
     4.6.  GNSS Measurements  . . . . . . . . . . . . . . . . . . . . 13
       4.6.1.  GNSS System and Signal . . . . . . . . . . . . . . . . 14
       4.6.2.  Time . . . . . . . . . . . . . . . . . . . . . . . . . 15
       4.6.3.  Per-Satellite Measurement Data . . . . . . . . . . . . 15
     4.7.  DSL Measurements . . . . . . . . . . . . . . . . . . . . . 16
       4.7.1.  L2TP Measurements  . . . . . . . . . . . . . . . . . . 17
       4.7.2.  RADIUS Measurements  . . . . . . . . . . . . . . . . . 17
       4.7.3.  Ethernet VLAN Tag Measurements . . . . . . . . . . . . 18
       4.7.4.  ATM Virtual Circuit Measurements . . . . . . . . . . . 18
   5.  Measurement Schemas  . . . . . . . . . . . . . . . . . . . . . 20
     5.1.  Measurement Container Schema . . . . . . . . . . . . . . . 20
     5.2.  Base Type Schema . . . . . . . . . . . . . . . . . . . . . 21
     5.3.  LLDP Measurement Schema  . . . . . . . . . . . . . . . . . 23
     5.4.  DHCP Measurement Schema  . . . . . . . . . . . . . . . . . 25
     5.5.  WiFi Measurement Schema  . . . . . . . . . . . . . . . . . 26
     5.6.  Cellular Measurement Schema  . . . . . . . . . . . . . . . 27
     5.7.  GNSS Measurement Schema  . . . . . . . . . . . . . . . . . 29
     5.8.  DSL Measurement Schema . . . . . . . . . . . . . . . . . . 31
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 34
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 35



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     7.1.  IANA Registry for GNSS Types . . . . . . . . . . . . . . . 35
     7.2.  URN Sub-Namespace Registration for
           urn:ietf:params:xml:ns:geopriv:lm  . . . . . . . . . . . . 36
     7.3.  URN Sub-Namespace Registration for
           urn:ietf:params:xml:ns:geopriv:lm:basetypes  . . . . . . . 37
     7.4.  URN Sub-Namespace Registration for
           urn:ietf:params:xml:ns:geopriv:lm:lldp . . . . . . . . . . 37
     7.5.  URN Sub-Namespace Registration for
           urn:ietf:params:xml:ns:geopriv:lm:dhcp . . . . . . . . . . 38
     7.6.  URN Sub-Namespace Registration for
           urn:ietf:params:xml:ns:geopriv:lm:wifi . . . . . . . . . . 39
     7.7.  URN Sub-Namespace Registration for
           urn:ietf:params:xml:ns:geopriv:lm:cell . . . . . . . . . . 39
     7.8.  URN Sub-Namespace Registration for
           urn:ietf:params:xml:ns:geopriv:lm:gnss . . . . . . . . . . 40
     7.9.  URN Sub-Namespace Registration for
           urn:ietf:params:xml:ns:geopriv:lm:dsl  . . . . . . . . . . 41
     7.10. XML Schema Registration for Measurement Container
           Schema . . . . . . . . . . . . . . . . . . . . . . . . . . 41
     7.11. XML Schema Registration for Base Types Schema  . . . . . . 42
     7.12. XML Schema Registration for LLDP Schema  . . . . . . . . . 42
     7.13. XML Schema Registration for DHCP Schema  . . . . . . . . . 42
     7.14. XML Schema Registration for WiFi Schema  . . . . . . . . . 42
     7.15. XML Schema Registration for Cellular Schema  . . . . . . . 43
     7.16. XML Schema Registration for GNSS Schema  . . . . . . . . . 43
     7.17. XML Schema Registration for DSL Schema . . . . . . . . . . 43
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 44
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 45
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 45
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 45
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 47
   Intellectual Property and Copyright Statements . . . . . . . . . . 48



















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1.  Introduction

   HELD [I-D.ietf-geopriv-http-location-delivery] describes a means for
   a device to request location information from an access network.  The
   LIS is expected to be able to retrieve the information necessary to
   generate location information.  As a part of the access network, the
   LIS is able to acquire measurement results from network devices
   within the network that are related to Device location.  The LIS also
   has access to information about the network topology that can be used
   to turn measurement data into location information.  However, this
   information can be enhanced with information acquired from the Device
   itself.

   This document describes a means for the Device to report location-
   related measurement data to the LIS.  This measurement data can be
   used by the LIS to improve the quality of the location estimate it
   produces.


































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2.  Conventions used in this document

   The terms LIS and Device are used in this document in a manner
   consistent with the usage in
   [I-D.ietf-geopriv-http-location-delivery].

   This document also uses the following definitions:

   Location Measurement:  An observation about the physical properties
      of a particular device's network access.  The result of a location
      measurement -- "location-related measurement data", or simply
      "measurement data" given sufficient context -- can be used to
      determine the location of a device; however, location-related
      measurement data does not identify a Device.  Measurement data can
      change with time if the location of the Device also changes.

      A location-related measurement data does not necessarily contain
      location information directly, but it can be used in combination
      with contextual knowledge of the network, or algorithms to derive
      location information.  Examples of location-related measurement
      data are: radio signal strength or timing measurements, Ethernet
      switch and port identifiers.

      Location-related measurement data can be considered sighting
      information, based on the definition in [RFC3693].

   Location Estimate:  The result of location determination, a location
      estimate is an approximation of where the Device is located.
      Location estimates are subject to uncertainty, which arise from
      errors in measurement results.

   GNSS:  Global Navigation Satellite System.  A satellite-based system
      that provides positioning and time information.  For example, the
      US Global Positioning System (GPS) or the European Galileo system.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].













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3.  Location-Related Measurements in HELD Requests

   This document defines a standard container for the conveyance of
   location-related measurement parameters in HELD requests.  This is an
   XML container that identifies parameters by type and allows the
   Device to provide the results of any measurement it is able to
   perform.  A set of measurement schemas are also defined that can be
   carried in the generic container.

   The simplest example of measurement data conveyance is illustrated by
   the example message in Figure 1.  This shows a HELD location request
   message with an Ethernet switch and port measurement taken using LLDP
   [IEEE.8021AB].

     <locationRequest xmlns="urn:ietf:params:xml:ns:geopriv:held">
       <locationType exact="true">civic</locationType>
       <measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm"
                     time="2008-04-29T14:33:58">
         <lldp xmlns="urn:ietf:params:xml:ns:geopriv:lm:lldp">
           <chassis type="4">0a01003c</chassis>
           <port type="6">c2</port>
         </lldp>
       </measurements>
     </locationRequest>

           Figure 1: HELD Location Request with Measurement Data

   Measurement data that the LIS does not support or understand can be
   ignored.

   Multiple sets of measurement data, either of the same type or from
   different sources can be included in the "measurements" element.  See
   Section 4.1.1 for details on repetition of this element.

   The LIS SHOULD validate any location information that is derived from
   measurement data provided by Devices.  Location information generated
   from measurement data SHOULD be compared against location information
   that the LIS is able to generate independently.  If the two results
   differ significantly, the LIS SHOULD discard the result that is
   derived from measurement data; the allowable degree of difference is
   left to local configuration or implementation.

   Using location-related measurement data is at the discretion of the
   LIS, but the "method" parameter in the PIDF-LO SHOULD be adjusted to
   reflect the method used.






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4.  Location-Related Measurement Data Types

   This document defines location-related measurement data types for a
   range of common network types.

   Note:  Not all of these measurement data types are provided by a
      Device; they may be acquired by other hosts in situations such as
      those described in [I-D.winterbottom-geopriv-lis2lis-req].

4.1.  Common Location-Related Measurement Fields

   This section describes metadata that is common to a wide range of
   measurement data.  Time of measurement and expiry time apply to all
   measurements; RMS error and number of samples apply to selected
   measurement types.

4.1.1.  Time of Measurement

   The "time" attribute records the time that the measurement or
   observation was made.  This time can be different to the time that
   the measurement information was reported.  Time information can be
   used to populate a timestamp on the location result, or to determine
   if the measurement information is used.

   The "time" attribute is optional to avoid forcing an arbitrary choice
   of timestamp for relatively static types of measurement (for
   instance, the DSL measurements in Section 4.7) and for legacy devices
   that don't record time information (such as the Home Location
   Register/Home Subscriber Server for cellular).  However, it is
   RECOMMENDED that it be provided whenever possible.

   The "time" attribute is attached to the root "measurement" element.
   If it is necessary to provide multiple sets of measurement data with
   different times, multiple "measurement" elements SHOULD be provided.

4.1.2.  Expiry Time on Location-Related Measurement Data

   A Device is able to indicate a time in the location measurement using
   the "expires" attribute.  Nominally, this attribute indicates how
   long information is expected to be valid for.  A Device MAY use this
   attribute to prevent the LIS from retaining measurement data or limit
   the time that a LIS retains this information.

   The LIS MUST NOT keep location-related measurement data beyond the
   time indicated in the "expires" attribute.  Where the "expires"
   attribute is not provided, the LIS MUST discard location-related
   measurement data immediately after servicing the current request.




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   Figure 2 shows an example of a measurement that includes an expiry
   attribute.

     <lm:measurements xmlns:lm="urn:ietf:params:xml:ns:geopriv:lm"
                      time="2008-04-29T14:33:58"
                      expires="2008-04-29T17:33:58">
       <wifi xmlns="urn:ietf:params:xml:ns:geopriv:lm:wifi">
         <servingWap>
           <ssid>wlan-home</ssid>
           <bssid>00-12-F0-A0-80-EF</bssid>
         </servingWap>
       </wifi>
     </lm:measurements>

                       Figure 2: Expiry Time Example

4.1.3.  RMS Error and Number of Samples

   Often a measurement is taken more than once over a period of time.
   Reporting the average of a number of measurement results mitigates
   the effects of random errors that occur in the measurement process.
   Typically, a mean value is reported, but additional information about
   the measurement process can be useful in determining location
   uncertainty.  Two optional attributes are provided for certain
   measurement values:

   rmsError:  The root-mean-squared (RMS) error of the set of
      measurement values used in calculating the result.  RMS error is
      expressed in the same units as the measurement, unless otherwise
      stated.

   samples:  The number of samples that were taken in determining the
      measurement value.  If omitted, this value can be assumed to be a
      very large value, such that the RMS error is an indication of the
      standard deviation of the sample set.

4.2.  LLDP Measurements

   LLDP messages are sent between adjacent nodes in an IEEE 802 network
   (e.g. wired Ethernet, WiFi, 802.16).  These messages all contain
   identification information for the sending node, which can be used to
   determine location information.  A Device that receives LLDP messages
   can report this information as a location-related measurement to the
   LIS, which is then able to use the measurement data in determining
   the location of the Device.

   The Device MUST report the values directly as they were provided by
   the adjacent node.  Attempting to adjust or translate the type of



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   identifier is likely to cause the measurement data to be useless.

   Where a Device has received LLDP messages from multiple adjacent
   nodes, it should provide information extracted from those messages by
   repeating the "lldp" element.

   An example of an LLDP measurement is shown in Figure 3.  This shows
   an adjacent node (chassis) that is identified by the IP address
   192.0.2.45 (hexadecimal c000022d) and the port on that node is
   numbered using an agent circuit ID [RFC3046] of 162 (hexadecimal a2).

     <measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm"
                   time="2008-04-29T14:33:58">
       <lldp xmlns="urn:ietf:params:xml:ns:geopriv:lm:lldp">
         <chassis type="4">c000022d</chassis>
         <port type="6">a2</port>
       </lldp>
     </measurements>

                    Figure 3: LLDP Measurement Example

   IEEE 802 Devices that are able to obtain information about adjacent
   network switches and their attachment to them by other means MAY use
   this data type to convey this information.

4.3.  DHCP Relay Agent Information Measurements

   The DHCP Relay Agent Information option [RFC3046] provides
   measurement data about the network attachment of a Device.  This
   measurement data can be included in the "dhcp-rai" element.

   The elements in the DHCP relay agent information options are opaque
   data types assigned by the DHCP relay agent.  The three items are all
   optional: circuit identifier ("circuit", [RFC3046]), remote
   identifier ("remote", [RFC3046], [RFC4649]) and subscriber identifier
   ("subscriber", [RFC3993], [RFC4580]).  The DHCPv6 remote identifier
   has an associated enterprise number [IANA.enterprise] as an XML
   attribute.

     <measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm"
                   time="2008-04-29T14:33:58">
       <dhcp-rai xmlns="urn:ietf:params:xml:ns:geopriv:lm:dhcp">
         <giaddr>::ffff:192.0.2.158</giaddr>
         <circuit>108b</circuit>
       </dhcp-rai>
     </measurements>

        Figure 4: DHCP Relay Agent Information Measurement Example



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4.4.  802.11 WLAN Measurements

   In WiFi, or 802.11, networks a Device might be able to provide
   information about the wireless access point (WAP) that it is attached
   to, or other WiFi points it is able to see.  This is provided using
   the "wifi" element, as shown in Figure 5.

   A wifi element is made up of a serving WAP, zero or more neighbouring
   WAPs, and an optional "nicType" element.  Each WAP element is
   comprised of the following fields:

   ssid:  The service set identifier for the wireless network.  This
      parameter must be provided.

   bssid:  The basic service set identifier.  This is the 48 bit
      Ethernet MAC address of the wireless access point and it must be
      provided.

   wapname:  The broadcast name for the wireless access point.  This
      element is optional.

   rssi:  The received signal strength indicator of the WAP as seen by
      the wireless receiver.  This value SHOULD be in units of dBm (with
      RMS error in dB).  If the units are unknown, the "dBm" attribute
      MUST be set to "false".  Signal strength reporting on current
      hardware uses a range of different units; therefore, the value of
      the "nicType" element SHOULD be included if the units are not
      known to be in dBm and the value reported by the hardware should
      be included without modification.  This element is optional and
      includes optional "rmsError" and "samples" attributes.

   The "nicType" element is used to specify the make and model of the
   wireless network interface card in the device.  Different 802.11
   chipsets report the signal strength in different ways, so the nic
   type must be specified in order for the LIS to use signal strength
   indicators as part of its location determination process.















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     <measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm"
                   time="2008-04-29T14:33:58">
       <wifi xmlns="urn:ietf:params:xml:ns:geopriv:lm:wifi">
         <nicType>Intel(r)PRO/Wireless 2200BG</nicType>
         <servingWap>
           <ssid>wlan-home</ssid>
           <bssid>00-12-F0-A0-80-EF</bssid>
           <rssi dBm="false">95</rssi>
         </servingWap>
         <neighbourWap>
           <ssid>wlan-home</ssid>
           <bssid>00-12-F0-A0-80-F0</bssid>
           <rssi dBm="false">15</rssi>
         </neighbourWap>
         <neighbourWap>
           <ssid>wlan-home</ssid>
           <bssid>00-12-F0-A0-80-F1</bssid>
           <rssi dBm="false">12</rssi>
         </neighbourWap>
         <neighbourWap>
           <ssid>wlan-home</ssid>
           <bssid>00-12-F0-A0-80-F2</bssid>
           <rssi dBm="false">5</rssi>
         </neighbourWap>
       </wifi>
     </measurements>

                 Figure 5: 802.11 WLAN Measurement Example

4.5.  Cellular Measurements

   GSM and UMTS cellular devices are common throughout the world and
   base station identifiers can provide a good source of coarse location
   information.  This information can be provided to a LIS run by the
   cellar operator, or may be provided to an alternative LIS operator
   that has access to one of several global cell-id to location mapping
   databases.  The cellular measurement set allows a device to report to
   a LIS any UMTS or GSM cells that it is able to hear, cells are
   reported using their global identifiers.












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     <measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm"
                   time="2008-04-29T14:33:58">
       <cellular xmlns="urn:ietf:params:xml:ns:geopriv:lm:cell">
         <servingCell>
           <mcc>123</mcc><mnc>06</mnc>
           <lac>16383</lac><cid>32767</cid>
         </servingCell>
       </cellular>
     </measurements>

                Figure 6: Example GSM Cellular Measurement


     <measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm"
                   time="2008-04-29T14:33:58">
       <cellular xmlns="urn:ietf:params:xml:ns:geopriv:lm:cell">
         <servingCell>
           <mcc>456</mcc><mnc>20</mnc>
           <rnc>2000</rnc><cid>65000</cid>
         </servingCell>
         <observedCell>
           <mcc>123</mcc><mnc>06</mnc>
           <lac>16383</lac><cid>32767</cid>
         </observedCell>
       </cellular>
     </measurements>

                Figure 7: Example UMTS Cellular Measurement

   In general a cellular device will be attached to the cellular network
   and so the notion of a serving cell exists.  Cellular network also
   provide overlap between neighbouring sites, so a mobile device can
   hear more than one cell.  The measurement schema supports sending
   both the serving cell and any other cells that the mobile might be
   able to hear.  In some cases, the device may simply be listening to
   cell information without actually attaching to the network, mobiles
   without a SIM are an example of this.  In this case the device may
   simply report cells it can hear without flagging one as a serving
   cell.  An example of this is shown in Figure 8.












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     <measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm"
                   time="2008-04-29T14:33:58">
       <cellular xmlns="urn:ietf:params:xml:ns:geopriv:lm:cell">
         <observedCell>
           <mcc>456</mcc><mnc>20</mnc>
           <rnc>2000</rnc><cid>65000</cid>
         </observedCell>
         <observedCell>
           <mcc>123</mcc><mnc>06</mnc>
           <lac>16383</lac><cid>32767</cid>
         </observedCell>
       </cellular>
     </measurements>

              Figure 8: Example Observed Cellular Measurement

4.6.  GNSS Measurements

   GNSS use orbiting satellites to transmit signals.  A Device with a
   GNSS receiver is able to take measurements from the satellite
   signals.  The results of these measurements can be used to determine
   time and the location of the Device.

   Determining location and time in autonomous GNSS receivers follows
   three steps:

   Signal acquisition:  During the signal acquisition stage, the
      receiver searches for the repeating code that is sent by each GNSS
      satellite.  Successful operation typically requires measurement
      data for a minimum of 5 satellites.  At this stage, measurement
      data is available to the device.

   Navigation message decode:  Once the signal has been acquired, the
      receiver then receives information about the configuration of the
      satellite constellation.  This information is broadcast by each
      satellite and is modulated with the base signal at a low rate; for
      instance, GPS sends this information at about 50 bits per second.

   Calculation:  The measurement data is combined with the data on the
      satellite constellation to determine the location of the receiver
      and the current time.

   A Device that uses a GNSS receiver is able to report measurements
   after the first stage of this process.  A LIS can use the results of
   these measurements to determine a location.  In the case where there
   are fewer results available than the optimal minimum, the LIS might
   be able to use other sources of measurement information and combine
   these with the available measurement data to determine a position.



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      Note: The use of different sets of GNSS _assistance data_ can
      reduce the amount of time required for the signal acquisition
      stage and obviate the need for the receiver to extract data on the
      satellite constellation.  Provision of assistance data is outside
      the scope of this document.

   Figure 9 shows an example of GNSS measurement data.  The measurement
   shown is for the GPS system and includes measurement data for three
   satellites only.

     <measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm"
                   time="2008-04-29T14:33:58">
       <gnss xmlns="urn:ietf:params:xml:ns:geopriv:lm:gnss"
             system="gps" signal="L1" coarsetime="false">
         <sat num="19">
           <doppler>499.9395</doppler>
           <codephase rmsError="1.6e-9">0.87595747</codephase>
           <cn0>45</cn0>
         </sat>
         <sat num="27">
           <doppler>378.2657</doppler>
           <codephase rmsError="1.6e-9">0.56639479</codephase>
           <cn0>52</cn0>
         </sat>
         <sat num="20">
           <doppler>-633.0309</doppler>
           <codephase  rmsError="1.6e-9">0.57016835</codephase>
           <cn0>48</cn0>
         </sat>
       </gnss>
     </measurements>

                    Figure 9: Example GNSS Measurement

   Each "gnss" element represents a single set of GNSS measurement data,
   taken at a single point in time.  Measurements taken at different
   times can be included in different "gnss" elements to enable
   iterative refinement of results.

   GNSS measurement parameters are described in more detail in the
   following sections.

4.6.1.  GNSS System and Signal

   The GNSS measurement structure is designed to be generic and to apply
   to different GNSS types.  Different signals within those systems are
   also accounted for and can be measured separately.




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   The GNSS type determines the time system that is used.  An indication
   of the type of system and signal can ensure that the LIS is able to
   correctly use measurements.

   Measurements for multiple GNSS types and signals can be included by
   repeating the "gnss" element.

   This document creates an IANA registry for GNSS types.  Two satellite
   systems are registered by this document: GPS and Galileo.  Details
   for the registry are included in Section 7.1.

4.6.2.  Time

   Each set of GNSS measurements is taken at a specific point in time.
   The "time" attribute is used to indicate the time that the
   measurement was acquired, if the receiver knows how the time system
   used by the GNSS relates to UTC time.

   Alternative to (or in addition to) the measurement time, the
   "gnssTime" element MAY be included.  The "gnssTime" element includes
   a relative time in milliseconds using the time system native to the
   satellite system.  For the GPS satellite system, the "gnssTime"
   element includes the time of week in milliseconds.  For the Galileo
   system, the "gnssTime" element includes the time of day in
   milliseconds.

   The "gnss" element includes an attribute, "coarsetime", that
   indicates whether or not the time was accurately recovered by the
   receiver.  The default value of "false" indicates that the
   uncertainty of the time value provided (either in the measurement set
   or in the the "gnssTime" element) is accurate to an uncertainty of
   less than one millisecond.  This parameter SHOULD be set to "true" if
   the receiver does not determine an accurate time before reporting
   measurement results.  If the "coarse" attribute is set to "true", the
   actual time is derived from the other measurement data; typically
   this means that additional per-satellite measurements are required.

4.6.3.  Per-Satellite Measurement Data

   Multiple satellites are included in each set of GNSS measurements
   using the "sat" element.  Each satellite is identified by a number in
   the "num" attribute.  The satellite number is consistent with the
   identifier used in the given GNSS.

   Both the GPS and Galileo systems use satellite numbers between 1 and
   64.

   The GNSS receiver measures the following parameters for each



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   satellite:

   doppler:  The observed Doppler shift of the satellite signal,
      measured in metres per second.  This is converted from a value in
      Hertz.

   codephase:  The observed code phase for the satellite signal,
      measured in milliseconds.  This is converted from a value in chips
      or wavelengths.  Increasing values indicate increasing
      pseudoranges.  This value includes an optional RMS error
      attribute, also measured in milliseconds.

   cn0:  The signal to noise ratio for the satellite signal, measured in
      decibel-Hertz (dB-Hz).  The expected range is between 20 and 50
      dB-Hz.

   mp:  An estimation of the amount of error that multipath signals
      contribute in metres.  This parameter is optional.

   cq:  An indication of the carrier quality.  Two attributes are
      included: "continuous" may be either "true" or "false"; direct may
      be either "direct" or "inverted".  This parameter is optional.

   adr:  The accumulated Doppler range, measured in metres.  This
      parameter is optional and is not necessary unless multiple sets of
      GNSS measurements are provided.

   All values are converted from measures native to the satellite system
   to generic measures to ensure consistency of interpretation.  Unless
   necessary, the schema does not constrain these values.

4.7.  DSL Measurements

   Digital Subscriber Line (DSL) networks rely on a range of network
   technology.  DSL deployments regularly require cooperation between
   multiple organizations.  These fall into two broad categories:
   infrastructure providers and Internet service providers (ISPs).
   Infrastructure providers manage the bulk of the physical
   infrastructure including cabling.  End users obtain their service
   from an ISP, which manages all aspects visible to the end user
   including IP address allocation and operation of a LIS.  See
   [DSL.TR025] and [DSL.TR101] for further information on DSL network
   deployments.

   Exchange of measurement information between these organizations is
   necessary for location information to be correctly generated.  The
   ISP LIS needs to acquire location information from the infrastructure
   provider.  However, the infrastructure provider has no knowledge of



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   Device identifiers, it can only identify a stream of data that is
   sent to the ISP.  This is resolved by passing measurement data
   relating to the Device to a LIS operated by the infrastructure
   provider.

4.7.1.  L2TP Measurements

   Layer 2 Tunneling Protocol (L2TP) is a common means of linking the
   infrastructure provider and the ISP.  The infrastructure provider LIS
   requires measurement data that identifies a single L2TP tunnel, from
   which it can generate location information.  Figure 10 shows an
   example L2TP measurement.

     <measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm"
                   time="2008-04-29T14:33:58">
       <dsl xmlns="urn:ietf:params:xml:ns:geopriv:lm:dsl">
         <l2tp>
           <src>192.0.2.10</src>
           <dest>192.0.2.61</dest>
           <session>528</session>
         </l2tp>
       </dsl>
     </measurements>

                  Figure 10: Example DSL L2TP Measurement

4.7.2.  RADIUS Measurements

   When authenticating network access, the infrastructure provider might
   employ a RADIUS [RFC2865] proxy at the DSL Access Module (DSLAM) or
   Access Node (AN).  These messages provide the ISP RADIUS server with
   an identifier for the DSLAM or AN, plus the slot and port that the
   Device is attached on.  These data can be provided as a measurement,
   which allows the infrastructure provider LIS to generate location
   information.

   The format of the AN, slot and port identifiers are not defined in
   the RADIUS protocol.  Slot and port together identify a circuit on
   the AN, analogous to the circuit identifier in [RFC3046].  These
   items are provided directly, as they were in the RADIUS message.  An
   example is shown in Figure 11.










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     <measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm"
                   time="2008-04-29T14:33:58">
       <dsl xmlns="urn:ietf:params:xml:ns:geopriv:lm:dsl">
         <an>AN-7692</an>
         <slot>3</slot>
         <port>06</port>
       </dsl>
     </measurements>

                 Figure 11: Example DSL RADIUS Measurement

4.7.3.  Ethernet VLAN Tag Measurements

   For Ethernet-based DSL access networks, the DSL Access Module (DSLAM)
   or Access Node (AN) provide two VLAN tags on packets.  A C-TAG is
   used to identify the incoming residential circuit, while the S-TAG is
   used to identify the DSLAM or AN.  The C-TAG and S-TAG together can
   be used to identify a single point of network attachment.  An example
   is shown in Figure 12.

     <measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm"
                   time="2008-04-29T14:33:58">
       <dsl xmlns="urn:ietf:params:xml:ns:geopriv:lm:dsl">
         <stag>613</stag>
         <ctag>1097</ctag>
       </dsl>
     </measurements>

                Figure 12: Example DSL VLAN Tag Measurement

   Alternatively, the C-TAG can be replaced by data on the slot and port
   that the Device is attached to.  This information might be included
   in RADIUS requests that are proxied from the infrastructure provider
   to the ISP RADIUS server.

4.7.4.  ATM Virtual Circuit Measurements

   An ATM virtual circuit can be employed between the ISP and
   infrastructure provider.  Providing the virtual port ID (VPI) and
   virtual circuit ID (VCI) for the virtual circuit gives the
   infrastructure provider LIS the ability to identify a single data
   stream.  A sample measurement is shown in Figure 13.









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     <measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm"
                   time="2008-04-29T14:33:58">
       <dsl xmlns="urn:ietf:params:xml:ns:geopriv:lm:dsl">
         <vpi>55</vpi>
         <vci>6323</vci>
       </dsl>
     </measurements>

                  Figure 13: Example DSL ATM Measurement










































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5.  Measurement Schemas

   The schema are broken up into their relative functions.  There is a
   base container schema into which all measurements are placed.  There
   is a basic types schema, that contains various base type definitions
   for things such as the "rmsError" and "samples" attributes IPv4, IPv6
   and MAC addresses.  Then each of the specific measurement types is
   defined in its own schema.

5.1.  Measurement Container Schema

   <?xml version="1.0"?>
   <xs:schema
       xmlns:lm="urn:ietf:params:xml:ns:geopriv:lm"
       xmlns:xs="http://www.w3.org/2001/XMLSchema"
       targetNamespace="urn:ietf:params:xml:ns:geopriv:lm"
       elementFormDefault="qualified"
       attributeFormDefault="unqualified">

     <xs:annotation>
       <xs:appinfo
           source="urn:ietf:params:xml:schema:geopriv:held:lm">
       </xs:appinfo>
       <xs:documentation source="http://www.ietf.org/rfc/rfcXXXX.txt">
         <!-- [[NOTE TO RFC-EDITOR: Please replace above URL with URL of
              published RFC and remove this note.]] -->
         This schema defines a framework for location measurements.
       </xs:documentation>
     </xs:annotation>

     <xs:element name="measurements">
       <xs:complexType>
         <xs:complexContent>
           <xs:restriction base="xs:anyType">
             <xs:sequence>
               <xs:any namespace="##other" processContents="lax"
                       minOccurs="0" maxOccurs="unbounded"/>
             </xs:sequence>
             <xs:attribute name="time" type="xs:dateTime"/>
             <xs:attribute name="expires" type="xs:dateTime"/>
             <xs:anyAttribute namespace="##any" processContents="lax"/>
           </xs:restriction>
         </xs:complexContent>
       </xs:complexType>
     </xs:element>

   </xs:schema>




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                      Measurement Containment Schema

5.2.  Base Type Schema

   Note that the pattern rules in the following schema wrap due to
   length constraints.  None of the patterns contain whitespace.

 <?xml version="1.0"?>
 <xs:schema
   xmlns:bt="urn:ietf:params:xml:ns:geopriv:lm:basetypes"
   xmlns:xs="http://www.w3.org/2001/XMLSchema"
   targetNamespace="urn:ietf:params:xml:ns:geopriv:lm:basetypes"
   elementFormDefault="qualified"
   attributeFormDefault="unqualified">

   <xs:annotation>
     <xs:appinfo
         source="urn:ietf:params:xml:schema:geopriv:lm:basetypes">
     </xs:appinfo>
     <xs:documentation source="http://www.ietf.org/rfc/rfcXXXX.txt">
       <!-- [[NOTE TO RFC-EDITOR: Please replace above URL with URL of
            published RFC and remove this note.]] -->
       This schema defines a set of base type elements.
     </xs:documentation>
   </xs:annotation>

   <xs:simpleType name="byteType">
     <xs:restriction base="xs:integer">
       <xs:minInclusive value="0"/>
       <xs:maxInclusive value="255"/>
     </xs:restriction>
   </xs:simpleType>
   <xs:simpleType name="twoByteType">
     <xs:restriction base="xs:integer">
       <xs:minInclusive value="0"/>
       <xs:maxInclusive value="65535"/>
     </xs:restriction>
   </xs:simpleType>

   <xs:simpleType name="nonNegativeDouble">
     <xs:restriction base="xs:double">
       <xs:minInclusive value="0.0"/>
     </xs:restriction>
   </xs:simpleType>
   <xs:simpleType name="positiveDouble">
     <xs:restriction base="bt:nonNegativeDouble">
       <xs:minExclusive value="0.0"/>
     </xs:restriction>



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   </xs:simpleType>

   <xs:complexType name="doubleWithRMSError">
     <xs:simpleContent>
       <xs:extension base="xs:double">
         <xs:attribute name="rmsError" type="bt:positiveDouble"/>
         <xs:attribute name="samples" type="xs:positiveInteger"/>
       </xs:extension>
     </xs:simpleContent>
   </xs:complexType>
   <xs:complexType name="nnDoubleWithRMSError">
     <xs:simpleContent>
       <xs:restriction base="bt:doubleWithRMSError">
         <xs:minInclusive value="0"/>
       </xs:restriction>
     </xs:simpleContent>
   </xs:complexType>

   <xs:simpleType name="ipAddressType">
     <xs:union memberTypes="bt:IPv6AddressType bt:IPv4AddressType"/>
   </xs:simpleType>

   <!-- IPv6 format definition -->
   <xs:simpleType name="IPv6AddressType">
     <xs:annotation>
       <xs:documentation>
         An IP version 6 address, based on RFC 4291.
       </xs:documentation>
     </xs:annotation>
     <xs:restriction base="xs:token">
       <!-- Fully specified address -->
       <xs:pattern value="[0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){7}"/>
       <!-- Double colon start -->
       <xs:pattern value=":(:[0-9A-Fa-f]{1,4}){1,7}"/>
       <!-- Double colon middle -->
       <xs:pattern value="([0-9A-Fa-f]{1,4}:){1,6}
                          (:[0-9A-Fa-f]{1,4}){1}"/>
       <xs:pattern value="([0-9A-Fa-f]{1,4}:){1,5}
                          (:[0-9A-Fa-f]{1,4}){1,2}"/>
       <xs:pattern value="([0-9A-Fa-f]{1,4}:){1,4}
                          (:[0-9A-Fa-f]{1,4}){1,3}"/>
       <xs:pattern value="([0-9A-Fa-f]{1,4}:){1,3}
                          (:[0-9A-Fa-f]{1,4}){1,4}"/>
       <xs:pattern value="([0-9A-Fa-f]{1,4}:){1,2}
                          (:[0-9A-Fa-f]{1,4}){1,5}"/>
       <xs:pattern value="([0-9A-Fa-f]{1,4}:){1}
                          (:[0-9A-Fa-f]{1,4}){1,6}"/>
       <!-- Double colon end -->



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       <xs:pattern value="([0-9A-Fa-f]{1,4}:){1,7}:"/>
       <!-- IPv4-Compatible and IPv4-Mapped Addresses -->
       <xs:pattern value="((:(:0{1,4}){0,3}:[fF]{4})|(0{1,4}:
                          (:0{1,4}){0,2}:[fF]{4})|((0{1,4}:){2}
                          (:0{1,4})?:[fF]{4})|((0{1,4}:){3}:[fF]{4})
                          |((0{1,4}:){4}[fF]{4})):(25[0-5]|2[0-4][0-9]|
                          [0-1]?[0-9]?[0-9])\.(25[0-5]|2[0-4][0-9]|[0-1]
                          ?[0-9]?[0-9])\.(25[0-5]|2[0-4][0-9]|[0-1]?
                          [0-9]?[0-9])\.(25[0-5]|2[0-4][0-9]|[0-1]?
                          [0-9]?[0-9])"/>
       <!-- The unspecified address -->
       <xs:pattern value="::"/>
     </xs:restriction>
   </xs:simpleType>

   <!-- IPv4 format definition -->
   <xs:simpleType name="IPv4AddressType">
     <xs:restriction base="xs:token">
       <xs:pattern value="(25[0-5]|2[0-4][0-9]|[0-1]?[0-9]?[0-9])\.
                          (25[0-5]|2[0-4][0-9]|[0-1]?[0-9]?[0-9])\.
                          (25[0-5]|2[0-4][0-9]|[0-1]?[0-9]?[0-9])\.
                          (25[0-5]|2[0-4][0-9]|[0-1]?[0-9]?[0-9])"/>
     </xs:restriction>
   </xs:simpleType>

   <!-- IEEE specifies a MAC address as having a -
        between 2 hex digit pairs -->
   <xs:simpleType name="macAddressType">
     <xs:restriction base="xs:token">
       <xs:pattern value="([0-9A-Fa-f]{2}-){5}([0-9A-Fa-f]{2})"/>
     </xs:restriction>
   </xs:simpleType>

 </xs:schema>

                             Base Type Schema

5.3.  LLDP Measurement Schema

  <?xml version="1.0"?>
  <xs:schema
      xmlns:lldp="urn:ietf:params:xml:ns:geopriv:lm:lldp"
      xmlns:bt="urn:ietf:params:xml:ns:geopriv:lm:basetypes"
      xmlns:xs="http://www.w3.org/2001/XMLSchema"
      targetNamespace="urn:ietf:params:xml:ns:geopriv:lm:lldp"
      elementFormDefault="qualified"
      attributeFormDefault="unqualified">




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    <xs:annotation>
      <xs:appinfo
          source="urn:ietf:params:xml:schema:geopriv:lm:lldp">
      </xs:appinfo>
      <xs:documentation source="http://www.ietf.org/rfc/rfcXXXX.txt">
        <!-- [[NOTE TO RFC-EDITOR: Please replace above URL with URL of
             published RFC and remove this note.]] -->
        This schema defines a set of LLDP location measurements.
      </xs:documentation>
    </xs:annotation>

    <xs:import namespace="urn:ietf:params:xml:ns:geopriv:lm:basetypes"/>

    <xs:element name="lldp" type="lldp:lldpMeasurementType"/>
    <xs:complexType name="lldpMeasurementType">
      <xs:complexContent>
        <xs:restriction base="xs:anyType">
          <xs:sequence>
            <xs:element name="chassis" type="lldp:lldpDataType"/>
            <xs:element name="port" type="lldp:lldpDataType"/>
            <xs:any namespace="##other" processContents="lax"
                    minOccurs="0" maxOccurs="unbounded"/>
          </xs:sequence>
          <xs:anyAttribute namespace="##any" processContents="lax"/>
        </xs:restriction>
      </xs:complexContent>
    </xs:complexType>

    <xs:complexType name="lldpDataType">
      <xs:simpleContent>
        <xs:extension base="lldp:lldpOctetStringType">
          <xs:attribute name="type" type="bt:byteType"
                        use="required"/>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>

    <xs:simpleType name="lldpOctetStringType">
      <xs:restriction base="xs:hexBinary">
        <xs:minLength value="1"/>
        <xs:maxLength value="255"/>
      </xs:restriction>
    </xs:simpleType>

  </xs:schema>

                          LLDP measurement schema




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5.4.  DHCP Measurement Schema

  <?xml version="1.0"?>
  <xs:schema
      xmlns:dhcp="urn:ietf:params:xml:ns:geopriv:lm:dhcp"
      xmlns:xs="http://www.w3.org/2001/XMLSchema"
      xmlns:bt="urn:ietf:params:xml:ns:geopriv:lm:basetypes"
      targetNamespace="urn:ietf:params:xml:ns:geopriv:lm:dhcp"
      elementFormDefault="qualified"
      attributeFormDefault="unqualified">

    <xs:annotation>
      <xs:appinfo
          source="urn:ietf:params:xml:schema:geopriv:lm:dhcp">
      </xs:appinfo>
      <xs:documentation source="http://www.ietf.org/rfc/rfcXXXX.txt">
        <!-- [[NOTE TO RFC-EDITOR: Please replace above URL with URL of
             published RFC and remove this note.]] -->
        This schema defines a set of DHCP location measurements.
      </xs:documentation>
    </xs:annotation>

    <xs:import namespace="urn:ietf:params:xml:ns:geopriv:lm:basetypes"/>

    <!-- DHCP Relay Agent Information Option -->
    <xs:element name="dhcp-rai" type="dhcp:dhcpType"/>
    <xs:complexType name="dhcpType">
      <xs:complexContent>
        <xs:restriction base="xs:anyType">
          <xs:sequence>
            <xs:element name="giaddr" type="bt:ipAddressType"/>
            <xs:element name="circuit"
                        type="xs:hexBinary" minOccurs="0"/>
            <xs:element name="remote"
                        type="dhcp:dhcpRemoteType" minOccurs="0"/>
            <xs:element name="subscriber"
                        type="xs:hexBinary" minOccurs="0"/>
            <xs:any namespace="##other" processContents="lax"
                    minOccurs="0" maxOccurs="unbounded"/>
          </xs:sequence>
          <xs:anyAttribute namespace="##any" processContents="lax"/>
        </xs:restriction>
      </xs:complexContent>
    </xs:complexType>

    <xs:complexType name="dhcpRemoteType">
      <xs:simpleContent>
        <xs:extension base="xs:hexBinary">



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          <xs:attribute name="enterprise" type="xs:positiveInteger"
                        use="optional"/>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>

  </xs:schema>

                          DHCP measurement schema

5.5.  WiFi Measurement Schema

  <?xml version="1.0"?>
  <xs:schema
      xmlns:wifi="urn:ietf:params:xml:ns:geopriv:lm:wifi"
      xmlns:bt="urn:ietf:params:xml:ns:geopriv:lm:basetypes"
      xmlns:xs="http://www.w3.org/2001/XMLSchema"
      targetNamespace="urn:ietf:params:xml:ns:geopriv:lm:wifi"
      elementFormDefault="qualified"
      attributeFormDefault="unqualified">

    <xs:annotation>
      <xs:appinfo
          source="urn:ietf:params:xml:schema:geopriv:lm:wifi">
        WiFi location measurements
      </xs:appinfo>
      <xs:documentation source="http://www.ietf.org/rfc/rfcXXXX.txt">
        <!-- [[NOTE TO RFC-EDITOR: Please replace above URL with URL of
             published RFC and remove this note.]] -->
        This schema defines a basic set of WiFi location measurements.
      </xs:documentation>
    </xs:annotation>

    <xs:import namespace="urn:ietf:params:xml:ns:geopriv:lm:basetypes"/>

    <xs:element name="wifi" type="wifi:wifiNetworkType"/>

    <xs:complexType name="wifiNetworkType">
      <xs:complexContent>
        <xs:restriction base="xs:anyType">
          <xs:sequence>
            <xs:element name="nicType" type="xs:token"
                        minOccurs="0"/>
            <xs:choice>
              <xs:element name="servingWap" type="wifi:wifiType"/>
              <xs:element name="neighbourWap" type="wifi:wifiType"/>
            </xs:choice>
            <xs:element name="neighbourWap" type="wifi:wifiType"



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                        minOccurs="0" maxOccurs="unbounded"/>
          </xs:sequence>
          <xs:anyAttribute namespace="##any" processContents="lax"/>
        </xs:restriction>
      </xs:complexContent>
    </xs:complexType>

    <xs:complexType name="wifiType">
      <xs:complexContent>
        <xs:restriction base="xs:anyType">
          <xs:sequence>
            <xs:element name="ssid" type="wifi:ssidBaseType"/>
            <xs:element name="bssid" type="bt:macAddressType"/>
            <xs:element name="wapname" type="wifi:ssidBaseType"
                        minOccurs="0"/>
            <xs:element name="rssi" type="wifi:rssiType"
                        minOccurs="0"/>
            <xs:any namespace="##other" processContents="lax"
                    minOccurs="0" maxOccurs="unbounded"/>
          </xs:sequence>
          <xs:anyAttribute namespace="##any" processContents="lax"/>
        </xs:restriction>
      </xs:complexContent>
    </xs:complexType>

    <xs:simpleType name="ssidBaseType">
      <xs:restriction base="xs:token">
        <xs:maxLength value="32"/>
      </xs:restriction>
    </xs:simpleType>

    <xs:complexType name="rssiType">
      <xs:simpleContent>
        <xs:extension base="bt:doubleWithRMSError">
          <xs:attribute name="dBm" type="xs:boolean" default="true"/>
        </xs:extension>
      </xs:simpleContent>
    </xs:complexType>

  </xs:schema>

                          WiFi measurement schema

5.6.  Cellular Measurement Schema

   <?xml version="1.0"?>
   <xs:schema
       xmlns:cell="urn:ietf:params:xml:ns:geopriv:lm:cell"



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       xmlns:xs="http://www.w3.org/2001/XMLSchema"
       targetNamespace="urn:ietf:params:xml:ns:geopriv:lm:cell"
       elementFormDefault="qualified"
       attributeFormDefault="unqualified">

     <xs:annotation>
       <xs:appinfo
           source="urn:ietf:params:xml:schema:geopriv:lm:cell">
       </xs:appinfo>
       <xs:documentation source="http://www.ietf.org/rfc/rfcXXXX.txt">
         <!-- [[NOTE TO RFC-EDITOR: Please replace above URL with URL of
              published RFC and remove this note.]] -->
         This schema defines a set of cellular location measurements.
       </xs:documentation>
     </xs:annotation>

     <xs:element name="cellular" type="cell:cellularType"/>

     <xs:complexType name="cellularType">
       <xs:complexContent>
         <xs:restriction base="xs:anyType">
           <xs:sequence>
             <xs:choice>
               <xs:element name="servingCell" type="cell:cellType"/>
               <xs:element name="observedCell" type="cell:cellType"/>
             </xs:choice>
             <xs:element name="observedCell" type="cell:cellType"
                         minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##any" processContents="lax"/>
         </xs:restriction>
       </xs:complexContent>
     </xs:complexType>

     <xs:complexType name="cellType">
       <xs:complexContent>
         <xs:restriction base="xs:anyType">
           <xs:choice>
             <xs:sequence>
               <xs:element name="mcc" type="cell:mccType"/>
               <xs:element name="mnc" type="cell:mncType"/>
               <xs:choice>
                 <xs:element name="rnc" type="cell:cellIdType"/>
                 <xs:element name="lac" type="cell:cellIdType"/>
               </xs:choice>
               <xs:element name="cid" type="cell:cellIdType"/>
             </xs:sequence>
             <xs:any namespace="##other" processContents="lax"



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                     minOccurs="0" maxOccurs="unbounded"/>
           </xs:choice>
         </xs:restriction>
       </xs:complexContent>
     </xs:complexType>

     <xs:simpleType name="mccType">
       <xs:restriction base="xs:token">
         <xs:pattern value="[0-9]{3}"/>
       </xs:restriction>
     </xs:simpleType>

     <xs:simpleType name="mncType">
       <xs:restriction base="xs:token">
         <xs:pattern value="[0-9]{2,3}"/>
       </xs:restriction>
     </xs:simpleType>

     <xs:simpleType name="cellIdType">
       <xs:restriction base="xs:nonNegativeInteger">
         <xs:maxInclusive value="65535"/>
       </xs:restriction>
     </xs:simpleType>

   </xs:schema>

                        Cellular measurement schema

5.7.  GNSS Measurement Schema

 <?xml version="1.0"?>
 <xs:schema
     xmlns:gnss="urn:ietf:params:xml:ns:geopriv:lm:gnss"
     xmlns:bt="urn:ietf:params:xml:ns:geopriv:lm:basetypes"
     xmlns:xs="http://www.w3.org/2001/XMLSchema"
     targetNamespace="urn:ietf:params:xml:ns:geopriv:lm:gnss"
     elementFormDefault="qualified"
     attributeFormDefault="unqualified">

   <xs:annotation>
     <xs:appinfo
         source="urn:ietf:params:xml:schema:geopriv:lm:gnss">
     </xs:appinfo>
     <xs:documentation source="http://www.ietf.org/rfc/rfcXXXX.txt">
       <!-- [[NOTE TO RFC-EDITOR: Please replace above URL with URL of
            published RFC and remove this note.]] -->
       This schema defines a set of GNSS location measurements
     </xs:documentation>



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   </xs:annotation>

   <xs:import namespace="urn:ietf:params:xml:ns:geopriv:lm:basetypes"/>

   <xs:element name="gnss" type="gnss:gnssMeasurementType">
     <xs:unique name="gnssSatellite">
       <xs:selector xpath="sat"/>
       <xs:field xpath="@num"/>
     </xs:unique>
   </xs:element>

   <xs:complexType name="gnssMeasurementType">
     <xs:complexContent>
       <xs:restriction base="xs:anyType">
         <xs:sequence>
           <xs:element name="gnssTime" type="bt:nonNegativeDouble"
                       minOccurs="0"/>
           <xs:element name="sat" type="gnss:gnssSatelliteType"
                       minOccurs="1" maxOccurs="64"/>
           <xs:any namespace="##other" processContents="lax"
                   minOccurs="0" maxOccurs="unbounded"/>
         </xs:sequence>
         <xs:attribute name="system" type="xs:token" use="required"/>
         <xs:attribute name="signal" type="xs:token"/>
         <xs:attribute name="coarsetime" type="xs:boolean"
                       default="false"/>
         <xs:anyAttribute namespace="##any" processContents="lax"/>
       </xs:restriction>
     </xs:complexContent>
   </xs:complexType>

   <xs:complexType name="gnssSatelliteType">
     <xs:complexContent>
       <xs:restriction base="xs:anyType">
         <xs:sequence>
           <xs:element name="doppler" type="xs:double"/>
           <xs:element name="codephase" type="bt:nnDoubleWithRMSError"/>
           <xs:element name="cn0" type="bt:nonNegativeDouble"/>
           <xs:element name="mp" type="bt:positiveDouble"
                       minOccurs="0"/>
           <xs:element name="cq" type="gnss:codePhaseQualityType"
                       minOccurs="0"/>
           <xs:element name="adr" type="xs:double" minOccurs="0"/>
         </xs:sequence>
         <xs:attribute name="num" type="xs:positiveInteger"
                       use="required"/>
       </xs:restriction>
     </xs:complexContent>



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   </xs:complexType>

   <xs:complexType name="codePhaseQualityType">
     <xs:complexContent>
       <xs:restriction base="xs:anyType">
         <xs:attribute name="continuous" type="xs:boolean"
                       default="true"/>
         <xs:attribute name="direct" use="required">
           <xs:simpleType>
             <xs:restriction base="xs:token">
               <xs:enumeration value="direct"/>
               <xs:enumeration value="inverted"/>
             </xs:restriction>
           </xs:simpleType>
         </xs:attribute>
       </xs:restriction>
     </xs:complexContent>
   </xs:complexType>
 </xs:schema>

                          GNSS measurement Schema

5.8.  DSL Measurement Schema

  <?xml version="1.0"?>
  <xs:schema
      xmlns:dsl="urn:ietf:params:xml:ns:geopriv:lm:dsl"
      xmlns:bt="urn:ietf:params:xml:ns:geopriv:lm:basetypes"
      xmlns:xs="http://www.w3.org/2001/XMLSchema"
      targetNamespace="urn:ietf:params:xml:ns:geopriv:lm:dsl"
      elementFormDefault="qualified"
      attributeFormDefault="unqualified">

    <xs:annotation>
      <xs:appinfo
          source="urn:ietf:params:xml:schema:geopriv:lm:dsl">
        DSL measurement definitions
      </xs:appinfo>
      <xs:documentation source="http://www.ietf.org/rfc/rfcXXXX.txt">
        <!-- [[NOTE TO RFC-EDITOR: Please replace above URL with URL of
             published RFC and remove this note.]] -->
        This schema defines a basic set of DSL location measurements.
      </xs:documentation>
    </xs:annotation>

    <xs:import namespace="urn:ietf:params:xml:ns:geopriv:lm:basetypes"/>

    <xs:element name="dsl" type="dsl:dslVlanType"/>



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    <xs:complexType name="dslVlanType">
      <xs:complexContent>
        <xs:restriction base="xs:anyType">
          <xs:choice>
            <xs:element name="l2tp">
              <xs:complexType>
                <xs:complexContent>
                  <xs:restriction base="xs:anyType">
                    <xs:sequence>
                      <xs:element name="src" type="bt:ipAddressType"/>
                      <xs:element name="dest" type="bt:ipAddressType"/>
                      <xs:element name="session"
                                  type="xs:nonNegativeInteger"/>
                    </xs:sequence>
                  </xs:restriction>
                </xs:complexContent>
              </xs:complexType>
            </xs:element>
            <xs:sequence>
              <xs:element name="an" type="xs:token"/>
              <xs:group ref="dsl:dslSlotPort"/>
            </xs:sequence>
            <xs:sequence>
              <xs:element name="stag" type="dsl:vlanIDType"/>
              <xs:choice>
                <xs:sequence>
                  <xs:element name="ctag" type="dsl:vlanIDType"/>
                  <xs:group ref="dsl:dslSlotPort" minOccurs="0"/>
                </xs:sequence>
                <xs:group ref="dsl:dslSlotPort"/>
              </xs:choice>
            </xs:sequence>
            <xs:sequence>
              <xs:element name="vpi" type="bt:byteType"/>
              <xs:element name="vci" type="bt:twoByteType"/>
            </xs:sequence>
            <xs:any namespace="##other" processContents="lax"
                    minOccurs="0" maxOccurs="unbounded"/>
          </xs:choice>
          <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:restriction>
      </xs:complexContent>
    </xs:complexType>
    <xs:simpleType name="vlanIDType">
      <xs:restriction base="xs:nonNegativeInteger">
        <xs:maxInclusive value="4095"/>
      </xs:restriction>
    </xs:simpleType>



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    <xs:group name="dslSlotPort">
      <xs:sequence>
        <xs:element name="slot" type="xs:token"/>
        <xs:element name="port" type="xs:token"/>
      </xs:sequence>
    </xs:group>

  </xs:schema>

                          DSL measurement schema









































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6.  Security Considerations

   Location-related measurement data are provided by the Device for the
   sole purpose of generating more accurate location information.  The
   LIS SHOULD NOT retain location-related measurement data for any
   longer than is necessary to generate location information.

   A LIS MUST NOT reveal location-related measurement data to any other
   entity unless given explicit permission by the Device.  This document
   does not include any means to indicate such permission.

   A Device is able to explicitly limit the time that a LIS stores
   measurement data by adding an expiry time to the measurement data,
   see Section 4.1.2.





































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7.  IANA Considerations

   This section creates a registry for GNSS types (Section 4.6) and
   registers the schema from Section 5.

7.1.  IANA Registry for GNSS Types

   This document establishes a new IANA registry for Global Navigation
   Satellite System (GNSS) types.  The registry includes tokens for the
   GNSS type and for each of the signals within that type.  Referring to
   [RFC2434], this registry operates under both "Expert Review" and
   "Specification Required" rules.  The IESG will appoint an Expert
   Reviewer who will advise IANA promptly on each request for a new or
   updated GNSS type.

   Each entry in the registry requires the following information:

   GNSS name:  the name and a brief description of the GNSS

   Brief description:  the name and a brief description of the GNSS

   GNSS token:  a token that can be used to identify the GNSS

   Signals:  a set of tokens that represent each of the signals that the
      system provides

   Documentation reference:  a reference to a stable, public
      specification that outlines usage of the GNSS, including (but not
      limited to) signal specifications and time systems; additionally
      assistance data formats and supporting protocols can be specified

   The registry initially includes two registrations:

   GNSS name:  Global Positioning System (GPS)

   Brief description:  a system of satellites that use spread-spectrum
      transmission, operated by the US military for commercial and
      military applications

   GNSS token:  gps

   Signals:  L1, L2, L1C, L2C, L5

   Documentation reference:  Navstar GPS Space Segment/Navigation User
      Interface [GPS.ICD]






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   GNSS name:  Galileo

   Brief description:  a system of satellites that operate in the same
      spectrum as GPS, operated by the European Union for commercial
      applications

   GNSS Token:  galileo

   Signals:  L1, E5A, E5B, E5A+B, E6

   Documentation Reference:  Galileo Open Service Signal In Space
      Interface Control Document (SIS ICD) [Galileo.ICD]

7.2.  URN Sub-Namespace Registration for
      urn:ietf:params:xml:ns:geopriv:lm

   This section registers a new XML namespace,
   "urn:ietf:params:xml:ns:geopriv:lm", as per the guidelines in
   [RFC3688].

      URI: urn:ietf:params:xml:ns:geopriv:lm

      Registrant Contact: IETF, GEOPRIV working group,
      (geopriv@ietf.org), Martin Thomson (martin.thomson@andrew.com).

      XML:

         BEGIN
           <?xml version="1.0"?>
           <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
           <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
             <head>
               <title>Measurement Container</title>
             </head>
             <body>
               <h1>Namespace for Location Measurement Container</h1>
               <h2>urn:ietf:params:xml:ns:geopriv:lm</h2>
   [[NOTE TO IANA/RFC-EDITOR: Please update RFC URL and replace XXXX
       with the RFC number for this specification.]]
               <p>See <a href="[[RFC URL]]">RFCXXXX</a>.</p>
             </body>
           </html>
         END







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7.3.  URN Sub-Namespace Registration for
      urn:ietf:params:xml:ns:geopriv:lm:basetypes

   This section registers a new XML namespace,
   "urn:ietf:params:xml:ns:geopriv:lm:basetypes", as per the guidelines
   in [RFC3688].

      URI: urn:ietf:params:xml:ns:geopriv:lm:basetypes

      Registrant Contact: IETF, GEOPRIV working group,
      (geopriv@ietf.org), Martin Thomson (martin.thomson@andrew.com).

      XML:

         BEGIN
           <?xml version="1.0"?>
           <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
           <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
             <head>
               <title>Base Device Types</title>
             </head>
             <body>
               <h1>Namespace for Base Types</h1>
               <h2>urn:ietf:params:xml:ns:geopriv:lm:basetypes</h2>
   [[NOTE TO IANA/RFC-EDITOR: Please update RFC URL and replace XXXX
       with the RFC number for this specification.]]
               <p>See <a href="[[RFC URL]]">RFCXXXX</a>.</p>
             </body>
           </html>
         END

7.4.  URN Sub-Namespace Registration for
      urn:ietf:params:xml:ns:geopriv:lm:lldp

   This section registers a new XML namespace,
   "urn:ietf:params:xml:ns:geopriv:lm:lldp", as per the guidelines in
   [RFC3688].

      URI: urn:ietf:params:xml:ns:geopriv:lm:lldp

      Registrant Contact: IETF, GEOPRIV working group,
      (geopriv@ietf.org), Martin Thomson (martin.thomson@andrew.com).

      XML:






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         BEGIN
           <?xml version="1.0"?>
           <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
           <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
             <head>
               <title>LLDP Measurement Set</title>
             </head>
             <body>
               <h1>Namespace for LLDP Measurement Set</h1>
               <h2>urn:ietf:params:xml:ns:geopriv:lm:lldp</h2>
   [[NOTE TO IANA/RFC-EDITOR: Please update RFC URL and replace XXXX
       with the RFC number for this specification.]]
               <p>See <a href="[[RFC URL]]">RFCXXXX</a>.</p>
             </body>
           </html>
         END

7.5.  URN Sub-Namespace Registration for
      urn:ietf:params:xml:ns:geopriv:lm:dhcp

   This section registers a new XML namespace,
   "urn:ietf:params:xml:ns:geopriv:lm:dhcp", as per the guidelines in
   [RFC3688].

      URI: urn:ietf:params:xml:ns:geopriv:lm:dhcp

      Registrant Contact: IETF, GEOPRIV working group,
      (geopriv@ietf.org), Martin Thomson (martin.thomson@andrew.com).

      XML:

         BEGIN
           <?xml version="1.0"?>
           <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
           <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
             <head>
               <title>DHCP Measurement Set</title>
             </head>
             <body>
               <h1>Namespace for DHCP Measurement Set</h1>
               <h2>urn:ietf:params:xml:ns:geopriv:lm:dhcp</h2>
   [[NOTE TO IANA/RFC-EDITOR: Please update RFC URL and replace XXXX
       with the RFC number for this specification.]]
               <p>See <a href="[[RFC URL]]">RFCXXXX</a>.</p>
             </body>
           </html>



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         END

7.6.  URN Sub-Namespace Registration for
      urn:ietf:params:xml:ns:geopriv:lm:wifi

   This section registers a new XML namespace,
   "urn:ietf:params:xml:ns:geopriv:lm:wifi", as per the guidelines in
   [RFC3688].

      URI: urn:ietf:params:xml:ns:geopriv:lm:wifi

      Registrant Contact: IETF, GEOPRIV working group,
      (geopriv@ietf.org), Martin Thomson (martin.thomson@andrew.com).

      XML:

         BEGIN
           <?xml version="1.0"?>
           <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
           <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
             <head>
               <title>WiFi Measurement Set</title>
             </head>
             <body>
               <h1>Namespace for WiFi Measurement Set</h1>
               <h2>urn:ietf:params:xml:ns:geopriv:lm:wifi</h2>
   [[NOTE TO IANA/RFC-EDITOR: Please update RFC URL and replace XXXX
       with the RFC number for this specification.]]
               <p>See <a href="[[RFC URL]]">RFCXXXX</a>.</p>
             </body>
           </html>
         END

7.7.  URN Sub-Namespace Registration for
      urn:ietf:params:xml:ns:geopriv:lm:cell

   This section registers a new XML namespace,
   "urn:ietf:params:xml:ns:geopriv:lm:cell", as per the guidelines in
   [RFC3688].

      URI: urn:ietf:params:xml:ns:geopriv:lm:cell

      Registrant Contact: IETF, GEOPRIV working group,
      (geopriv@ietf.org), Martin Thomson (martin.thomson@andrew.com).

      XML:




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         BEGIN
           <?xml version="1.0"?>
           <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
           <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
             <head>
               <title>Cellular Measurement Set</title>
             </head>
             <body>
               <h1>Namespace for Cellular Measurement Set</h1>
               <h2>urn:ietf:params:xml:ns:geopriv:lm:cell</h2>
   [[NOTE TO IANA/RFC-EDITOR: Please update RFC URL and replace XXXX
       with the RFC number for this specification.]]
               <p>See <a href="[[RFC URL]]">RFCXXXX</a>.</p>
             </body>
           </html>
         END

7.8.  URN Sub-Namespace Registration for
      urn:ietf:params:xml:ns:geopriv:lm:gnss

   This section registers a new XML namespace,
   "urn:ietf:params:xml:ns:geopriv:lm:gnss", as per the guidelines in
   [RFC3688].

      URI: urn:ietf:params:xml:ns:geopriv:lm:gnss

      Registrant Contact: IETF, GEOPRIV working group,
      (geopriv@ietf.org), Martin Thomson (martin.thomson@andrew.com).

      XML:

         BEGIN
           <?xml version="1.0"?>
           <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
           <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
             <head>
               <title>GNSS Measurement Set</title>
             </head>
             <body>
               <h1>Namespace for GNSS Measurement Set</h1>
               <h2>urn:ietf:params:xml:ns:geopriv:lm:gnss</h2>
   [[NOTE TO IANA/RFC-EDITOR: Please update RFC URL and replace XXXX
       with the RFC number for this specification.]]
               <p>See <a href="[[RFC URL]]">RFCXXXX</a>.</p>
             </body>
           </html>



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         END

7.9.  URN Sub-Namespace Registration for
      urn:ietf:params:xml:ns:geopriv:lm:dsl

   This section registers a new XML namespace,
   "urn:ietf:params:xml:ns:geopriv:lm:dsl", as per the guidelines in
   [RFC3688].

      URI: urn:ietf:params:xml:ns:geopriv:lm:dsl

      Registrant Contact: IETF, GEOPRIV working group,
      (geopriv@ietf.org), Martin Thomson (martin.thomson@andrew.com).

      XML:

         BEGIN
           <?xml version="1.0"?>
           <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
             "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
           <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
             <head>
               <title>DSL Measurement Set</title>
             </head>
             <body>
               <h1>Namespace for DSL Measurement Set</h1>
               <h2>urn:ietf:params:xml:ns:geopriv:lm:dsl</h2>
   [[NOTE TO IANA/RFC-EDITOR: Please update RFC URL and replace XXXX
       with the RFC number for this specification.]]
               <p>See <a href="[[RFC URL]]">RFCXXXX</a>.</p>
             </body>
           </html>
         END

7.10.  XML Schema Registration for Measurement Container Schema

   This section registers an XML schema as per the guidelines in
   [RFC3688].

   URI:  urn:ietf:params:xml:schema:lm

   Registrant Contact:  IETF, GEOPRIV working group, (geopriv@ietf.org),
      Martin Thomson (martin.thomson@andrew.com).

   Schema:  The XML for this schema can be found in Section 5.1 of this
      document.





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7.11.  XML Schema Registration for Base Types Schema

   This section registers an XML schema as per the guidelines in
   [RFC3688].

   URI:  urn:ietf:params:xml:schema:lm:basetypes

   Registrant Contact:  IETF, GEOPRIV working group, (geopriv@ietf.org),
      Martin Thomson (martin.thomson@andrew.com).

   Schema:  The XML for this schema can be found in Section 5.2 of this
      document.

7.12.  XML Schema Registration for LLDP Schema

   This section registers an XML schema as per the guidelines in
   [RFC3688].

   URI:  urn:ietf:params:xml:schema:lm:lldp

   Registrant Contact:  IETF, GEOPRIV working group, (geopriv@ietf.org),
      Martin Thomson (martin.thomson@andrew.com).

   Schema:  The XML for this schema can be found in Section 5.3 of this
      document.

7.13.  XML Schema Registration for DHCP Schema

   This section registers an XML schema as per the guidelines in
   [RFC3688].

   URI:  urn:ietf:params:xml:schema:lm:dhcp

   Registrant Contact:  IETF, GEOPRIV working group, (geopriv@ietf.org),
      Martin Thomson (martin.thomson@andrew.com).

   Schema:  The XML for this schema can be found in Section 5.4 of this
      document.

7.14.  XML Schema Registration for WiFi Schema

   This section registers an XML schema as per the guidelines in
   [RFC3688].

   URI:  urn:ietf:params:xml:schema:lm:wifi






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   Registrant Contact:  IETF, GEOPRIV working group, (geopriv@ietf.org),
      Martin Thomson (martin.thomson@andrew.com).

   Schema:  The XML for this schema can be found in Section 5.5 of this
      document.

7.15.  XML Schema Registration for Cellular Schema

   This section registers an XML schema as per the guidelines in
   [RFC3688].

   URI:  urn:ietf:params:xml:schema:lm:cellular

   Registrant Contact:  IETF, GEOPRIV working group, (geopriv@ietf.org),
      Martin Thomson (martin.thomson@andrew.com).

   Schema:  The XML for this schema can be found in Section 5.6 of this
      document.

7.16.  XML Schema Registration for GNSS Schema

   This section registers an XML schema as per the guidelines in
   [RFC3688].

   URI:  urn:ietf:params:xml:schema:lm:gnss

   Registrant Contact:  IETF, GEOPRIV working group, (geopriv@ietf.org),
      Martin Thomson (martin.thomson@andrew.com).

   Schema:  The XML for this schema can be found in Section 5.7 of this
      document.

7.17.  XML Schema Registration for DSL Schema

   This section registers an XML schema as per the guidelines in
   [RFC3688].

   URI:  urn:ietf:params:xml:schema:lm:dsl

   Registrant Contact:  IETF, GEOPRIV working group, (geopriv@ietf.org),
      Martin Thomson (martin.thomson@andrew.com).

   Schema:  The XML for this schema can be found in Section 5.8 of this
      document.







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8.  Acknowledgements

   Thanks go to Simon Cox for his comments relating to terminology that
   have helped ensure that this document is aligns with ongoing work in
   the Open Geospatial Consortium (OGC).  Thanks to Dr Neil Harper for
   his review and comments on the GNSS sections of this document.
   Thanks to Noor-E-Gagan Singh for his suggestions relating to the WiFi
   section of this document.











































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9.  References

9.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2434]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 2434,
              October 1998.

   [I-D.ietf-geopriv-http-location-delivery]
              Barnes, M., Winterbottom, J., Thomson, M., and B. Stark,
              "HTTP Enabled Location Delivery (HELD)",
              draft-ietf-geopriv-http-location-delivery-07 (work in
              progress), April 2008.

9.2.  Informative References

   [RFC3693]  Cuellar, J., Morris, J., Mulligan, D., Peterson, J., and
              J. Polk, "Geopriv Requirements", RFC 3693, February 2004.

   [RFC3046]  Patrick, M., "DHCP Relay Agent Information Option",
              RFC 3046, January 2001.

   [RFC4649]  Volz, B., "Dynamic Host Configuration Protocol for IPv6
              (DHCPv6) Relay Agent Remote-ID Option", RFC 4649,
              August 2006.

   [IANA.enterprise]
              IANA, "Private Enterprise Numbers",
              <http://www.iana.org/assignments/enterprise-numbers>.

   [RFC3993]  Johnson, R., Palaniappan, T., and M. Stapp, "Subscriber-ID
              Suboption for the Dynamic Host Configuration Protocol
              (DHCP) Relay Agent Option", RFC 3993, March 2005.

   [RFC4580]  Volz, B., "Dynamic Host Configuration Protocol for IPv6
              (DHCPv6) Relay Agent Subscriber-ID Option", RFC 4580,
              June 2006.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              January 2004.

   [IEEE.8021AB]
              IEEE, "IEEE Standard for Local and Metropolitan area
              networks, Station and Media Access Control Connectivity
              Discovery",  802.1AB, June 2005.



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   [GPS.ICD]  "Navstar GPS Space Segment/Navigation User Interface",
              ICD GPS-200, Apr 2000.

   [Galileo.ICD]
              GJU, "Galileo Open Service Signal In Space Interface
              Control Document (SIS ICD)", May 2006.

   [I-D.winterbottom-geopriv-lis2lis-req]
              Winterbottom, J. and S. Norreys, "LIS to LIS Protocol
              Requirements", draft-winterbottom-geopriv-lis2lis-req-01
              (work in progress), November 2007.

   [DSL.TR025]
              Wang, R., "Core Network Architecture Recommendations for
              Access to Legacy Data Networks over ADSL", September 1999.

   [DSL.TR101]
              Cohen, A. and E. Shrum, "Migration to Ethernet-Based DSl
              Aggregation", April 2006.

   [RFC2865]  Rigney, C., Willens, S., Rubens, A., and W. Simpson,
              "Remote Authentication Dial In User Service (RADIUS)",
              RFC 2865, June 2000.




























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Authors' Addresses

   Martin Thomson
   Andrew
   PO Box U40
   Wollongong University Campus, NSW  2500
   AU

   Phone: +61 2 4221 2915
   Email: martin.thomson@andrew.com
   URI:   http://www.andrew.com/


   James Winterbottom
   Andrew
   PO Box U40
   Wollongong University Campus, NSW  2500
   AU

   Phone: +61 2 4221 2938
   Email: james.winterbottom@andrew.com
   URI:   http://www.andrew.com/





























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Full Copyright Statement

   Copyright (C) The IETF Trust (2008).

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   contained in BCP 78, and except as set forth therein, the authors
   retain all their rights.

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