One document matched: draft-thomson-geopriv-wimax-measurements-00.txt
GEOPRIV M. Thomson
Internet-Draft J. Winterbottom
Intended status: Standards Track Andrew
Expires: November 23, 2008 May 22, 2008
Location Measurements for IEEE 802.16e Devices
draft-thomson-geopriv-wimax-measurements-00
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Internet-Draft Location Measurements for 802.16e May 2008
Abstract
IEEE 802.16e defines means for true mobility within an 802.16
wireless network. Determining an accurate location for 802.16e
devices requires information on radio parameters. A format is
defined for location-related measurement data that can be provided by
an 802.16e device. This measurement data can be used by a Location
Information Server (LIS) to more accurately determine the location of
the device.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions used in this document . . . . . . . . . . . . . . 4
3. 802.16e Measurement Data . . . . . . . . . . . . . . . . . . . 5
4. 802.16e Measurement Schema . . . . . . . . . . . . . . . . . . 8
5. Security Considerations . . . . . . . . . . . . . . . . . . . 10
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
6.1. URN Sub-Namespace Registration for
urn:ietf:params:xml:ns:held:lm:802.16e . . . . . . . . . . 11
6.2. XML Schema Registration for 802.16e Measurement Schema . . 11
7. Normative References . . . . . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13
Intellectual Property and Copyright Statements . . . . . . . . . . 14
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1. Introduction
Determining the location of a device in an IEEE 802.16e [IEEE.80216E]
mobile wireless network requires information from the device to
improve the accuracy of the final result. Radio timing information
provided by the device can enable the calculation of a more accurate
location estimate by a Location Information Server (LIS).
This document describes a standard format for 802.16e measurement
data that is based on radio measurements made of base stations near
the device.
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2. Conventions used in this document
This document builds on [I-D.thomson-geopriv-held-measurements] and
consequently uses the same set of terminology. Terminology from
[IEEE.80216E] is used where appropriate.
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. 802.16e Measurement Data
A subscriber station (SS) in an 802.16e network is able to observe
radio signals from each base station (BS) in its proximity. By
observing the timing and strength of these signals, a SS is able to
provide a LIS with information that can be used to determine its
location.
The most basic 802.16e measurement indicates the serving BS, as shown
in Figure 1.
<locationRequest xmlns="urn:ietf:params:xml:ns:geopriv:held">
<locationType exact="true">civic</locationType>
<measurements xmlns="urn:ietf:params:xml:ns:geopriv:lm">
<w16e xmlns="urn:ietf:params:xml:ns:geopriv:lm:802.16e">
<servingBS id="00-21-43-65-87-a9"/>
</w16e>
</measurements>
</locationRequest>
Figure 1: HELD Location Request with 802.16e Measurement Data
More measurement information can be provided, including timing
measurement information for additional serving base stations (if fast
base station switching or macro-diversity hand-over are in progress).
Information on neighbouring base stations can be provided in addition
to that for the serving BS, or instead of if the SS is not currently
attached to the 802.16e interface.
The set measurement data that is included is chosen by the SS and
will depend on the time it has available to acquire the measurements.
The following measurement information may be provided:
id: (Attribute) The base station identifier for the serving or
neighbour BS. Note that while this isn't a MAC address, it shares
the encoding defined for the MAC address.
rssi: The receive signal strength indicator, calculated as defined
in [IEEE.80216E]. This value is measured in units of dBm. This
datum optionally includes an RMS error in dB and sample count.
cinr: The signal to noise ratio, calculated as defined in
[IEEE.80216E]. This value is measured in units of dB. This datum
optionally includes an RMS error and sample count.
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rd: Relative delay of the signal from the BS, measured relative to
other base stations. Since this value is relative, it MUST be
included on at least two BS measurements to be of any use. It is
RECOMMENDED that this value be set to "0" for the first BS in the
measured set. This value is measured in seconds, but measurement
uncertainty for a single sample is expected to be approximately
one sample. This datum optionally includes an RMS error and
sample count.
(V) _
| `- _ t[1]
| `- _ t[2]
| BS1 ` . - - - - - - - - - - (V)
_|`. |
|U| `. t[3] |
|_| `. BS2 |
Target SS `.
(V)
|
|
| BS3
Figure 2: Relative Delay Example
Based on the example in Figure 2, relative delay can be calculated
based on the relative time that signals transmitted simultaneously
(or with known relative times) by base stations can be calculated.
If the time of receipt of the signal from each base station is
t[x] and the relative delay for BS1 is set to zero, the relative
time for each subsequent measured base station is t[x] - t[1].
rtd: Round trip delay of the signal from the SS to the BS and back.
This measurement datum is only applicable for each serving BS.
This value is measured in seconds, but measurement uncertainty for
a single sample is expected to be approximately one sample. This
datum optionally includes an RMS error and sample count.
The "rmsError" attribute for signal to noise and received signal
strength MAY be calculated using the continuous weighted average
method described in [IEEE.80216E]. Values of "alpha_AVG" and "k" are
selected by the SS.
The XML format described in this document provides a greater range of
values than the Scanning Results Report ("MOB_SCN-REP") or the
Channel measurement Report Response ("REP-RSP") message. This allows
for the reporting of measurements in a manner less constrained by
encoding. A greater range of values does not necessarily imply
anything about the uncertainty in those measurements; the RMS error
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is used to indicate the magnitude of any error.
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4. 802.16e Measurement Schema
<?xml version="1.0"?>
<xs:schema
targetNamespace="urn:ietf:params:xml:ns:geopriv:lm:802.16e"
xmlns:w16e="urn:ietf:params:xml:ns:geopriv:lm:802.16e"
xmlns:bt="urn:ietf:params:xml:ns:geopriv:lm:basetypes"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:annotation>
<xs:documentation source="https://www.ietf.org/rfc/rfcXXXX.txt">
<!-- [[NOTE TO RFC-EDITOR: Please replace above URL with URL of
published RFC and remove this note.]] -->
This document defines a location-related measurement format
for 802.16e mobile wireless devices.
</xs:documentation>
</xs:annotation>
<xs:import namespace="urn:ietf:params:xml:ns:geopriv:lm:basetypes"/>
<xs:element name="w16e" type="w16e:w16eType"/>
<xs:complexType name="w16eType">
<xs:complexContent>
<xs:restriction base="xs:anyType">
<xs:sequence>
<xs:choice>
<xs:element ref="w16e:servingBS" maxOccurs="unbounded"/>
<xs:element ref="w16e:neighbourBS"/>
</xs:choice>
<xs:element ref="w16e:neighbourBS"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<xs:element name="neighbourBS" type="w16e:bsType"/>
<xs:complexType name="bsType">
<xs:complexContent>
<xs:restriction base="xs:anyType">
<xs:sequence>
<xs:element name="rssi" type="bt:doubleWithRMSError"
minOccurs="0"/>
<xs:element name="cinr" type="bt:doubleWithRMSError"
minOccurs="0"/>
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<xs:element name="rd" type="bt:doubleWithRMSError"
minOccurs="0"/>
</xs:sequence>
<xs:attribute name="id" type="bt:macAddressType"/>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<xs:element name="servingBS" type="w16e:servingBsType"/>
<xs:complexType name="servingBsType">
<xs:complexContent>
<xs:extension base="w16e:bsType">
<xs:sequence>
<xs:element name="rtd" type="bt:nnDoubleWithRMSError"
minOccurs="0"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:schema>
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5. Security Considerations
The considerations of [I-D.thomson-geopriv-held-measurements] apply.
However, the receiver of 802.16e measurement information requires
knowledge of the location of base stations to make effective use of
the information.
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6. IANA Considerations
6.1. URN Sub-Namespace Registration for
urn:ietf:params:xml:ns:held:lm:802.16e
This section registers a new XML namespace,
"urn:ietf:params:xml:ns:held:lm:802.16e", following the guidelines in
[RFC3688].
URI: urn:ietf:params:xml:ns:held: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>802.16e Measurements</title>
</head>
<body>
<h1>Namespace for 802.16e Measurements</h1>
<h2>urn:ietf:params:xml:ns:held:lm:802.16e</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
6.2. XML Schema Registration for 802.16e Measurement Schema
This section registers an XML schema following the guidelines in
[RFC3688].
URI: urn:ietf:params:xml:schema:held:lm:802.16e
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 4 of this
document.
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7. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
January 2004.
[I-D.thomson-geopriv-held-measurements]
Thomson, M. and J. Winterbottom, "Using Device-provided
Location-Related Measurements in HELD",
draft-thomson-geopriv-held-measurements-02 (work in
progress), May 2008.
[IEEE.80216E]
IEEE, "Air Interface for Fixed and Mobile Broadband
Wireless Access Systems; Physical and Medium Access
Control Layers for Combined Fixed and Mobile Operation in
Licensed Bands", Std 802.16E, February 2006.
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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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