Location Measurements for IEEE 802.16e Devices

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. A separate measurement used for identifying WiMAX session-related parameters is also provided.

Status of this Memo

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1. Introduction
2. Conventions used in this document
3. 802.16e Radio Measurement Data
4. WiMAX Session-Related Measurements
5. 802.16e Measurement Schema
6. Security Considerations
7. IANA Considerations
7.1. URN Sub-Namespace Registration for urn:ietf:params:xml:ns:held:lm:802.16e
7.2. XML Schema Registration for 802.16e Measurement Schema
8. Normative References
§ Authors' Addresses

1. Introduction

This document describes a standard format for 802.16e measurement data that is based on radio measurements made of base stations near the device.

2. Conventions used in this document

3. 802.16e Radio 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.

More measurement information can be provided, including timing measurement information for additional serving base stations (if fast base station switching (FBSS) or macro-diversity hand-over (MDHO) are in progress). Information on neighbouring base stations can be provided in addition to that for the serving BS.

The set of measurement data is chosen by the SS and the presence of specific elements will depend on the time the SS has available to acquire the measurements. The following measurement information may be provided:

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 is used to indicate the magnitude of any error.

4. WiMAX Session-Related Measurements

In Worldwide Interoperability for Microwave Access (WiMAX) networks [WiMAX.LBS] (WiMAX Forum, “WiMAX Network Protocols and Architecture for Location Based Services,” November 2008.), an SS might have a particular access network designated as a "home network". In some configurations the network is designed in such a way that the SS only has access to a location server in the home network, known as a home location server, or hLS. However, a server in the current (visited) access network - the vLS - could be the only server that is capable of communicating with the access network to determine the location of the SS. In this case the hLS provides WiMAX session information to the vLS, giving the vLS the information necessary to identify a session and generate location information.

Session parameters are used to identify a particular network attachment session:

5. 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"/>
          <xs:element name="rd" type="bt:doubleWithRMSError"
                      minOccurs="0"/>
          <xs:any namespace="##other" processContents="lax"
                  minOccurs="0" maxOccurs="unbounded"/>
        </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:element name="wimaxSession" type="w16e:wimaxSessionType"/>

  <xs:complexType name="wimaxSessionType">
    <xs:complexContent>
      <xs:restriction base="xs:anyType">
        <xs:sequence>
          <xs:element name="sessionID" type="xs:hexBinary"/>
          <xs:element name="nai" type="w16e:naiType"/>
          <xs:element name="anchor" type="w16e:anchorType"/>
          <xs:any namespace="##other" processContents="lax"
                  minOccurs="0" maxOccurs="unbounded"/>
        </xs:sequence>
      </xs:restriction>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="anchorType">
    <xs:simpleContent>
      <xs:extension base="w16e:domainType">
        <xs:attribute name="ip" type="bt:ipAddressType"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>

  <xs:simpleType name="domainType">
    <xs:restriction base="xs:token">
      <xs:pattern
          value="([a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])?\.?)+"/>
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="naiType">
    <xs:restriction base="xs:token">
      <xs:pattern
          value="([^\\]|\\[\dA-Fa-f]{2})*
                 (@([A-Za-z\d]([A-Za-z\d\-]*[A-Za-z\d])*\.)+
                  [A-Za-z\d]([A-Za-z\d\-]*[A-Za-z\d])*)?"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

[RFC2119]	Bradner, S., “Key words for use in RFCs to Indicate Requirement Levels,” BCP 14, RFC 2119, March 1997 (TXT, HTML, XML).
[RFC3688]	Mealling, M., “The IETF XML Registry,” BCP 81, RFC 3688, January 2004 (TXT).
[RFC4282]	Aboba, B., Beadles, M., Arkko, J., and P. Eronen, “The Network Access Identifier,” RFC 4282, December 2005 (TXT).
[I-D.thomson-geopriv-held-measurements]	Thomson, M. and J. Winterbottom, “Using Device-provided Location-Related Measurements in Location Configuration Protocols,” draft-thomson-geopriv-held-measurements-05 (work in progress), October 2009 (TXT).
[I-D.ietf-geopriv-held-identity-extensions]	Winterbottom, J., Thomson, M., Tschofenig, H., and R. Barnes, “Use of Device Identity in HTTP-Enabled Location Delivery (HELD),” draft-ietf-geopriv-held-identity-extensions-03 (work in progress), February 2010 (TXT).
[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.
[WiMAX.LBS]	WiMAX Forum, “WiMAX Network Protocols and Architecture for Location Based Services,” Network Release 1.5 1.0.0 Draft, November 2008.

	Martin Thomson
	Andrew Corporation
	Andrew Building (39)
	Wollongong University Campus
	Northfields Avenue
	Wollongong, NSW 2522
	AU
Email:	martin.thomson@andrew.com

	James Winterbottom
	Andrew Corporation
	Andrew Building (39)
	Wollongong University Campus
	Northfields Avenue
	Wollongong, NSW 2522
	AU
Email:	james.winterbottom@andrew.com

Location Measurements for IEEE 802.16e Devices
draft-thomson-geopriv-wimax-measurements-03

Abstract

Status of this Memo

Copyright Notice

Table of Contents

1. Introduction

2. Conventions used in this document

3. 802.16e Radio Measurement Data

4. WiMAX Session-Related Measurements

5. 802.16e Measurement Schema

6. Security Considerations

7. IANA Considerations

7.1. URN Sub-Namespace Registration for urn:ietf:params:xml:ns:held:lm:802.16e

7.2. XML Schema Registration for 802.16e Measurement Schema

8. Normative References

Authors' Addresses

Location Measurements for IEEE 802.16e Devicesdraft-thomson-geopriv-wimax-measurements-03

Abstract

Status of this Memo

Copyright Notice

Table of Contents

1. Introduction

2. Conventions used in this document

3. 802.16e Radio Measurement Data

4. WiMAX Session-Related Measurements

5. 802.16e Measurement Schema

6. Security Considerations

7. IANA Considerations

7.1. URN Sub-Namespace Registration for urn:ietf:params:xml:ns:held:lm:802.16e

7.2. XML Schema Registration for 802.16e Measurement Schema

8. Normative References

Authors' Addresses

Location Measurements for IEEE 802.16e Devices
draft-thomson-geopriv-wimax-measurements-03