# Presentation: 231059

## E911 PHASE 2 LOCATION SOLUTION LANDSCAPE 

**Mark Birchler, Manager**
**Wireless Access Technology Research**
**Motorola Labs**
**birchler@rsch.comm.mot.com**

## ACRONYMS

**A-GPS**
**Assisted Global Positioning System**
**AOA**
**Angle of Arrival**
**E-FLT**
**Enhanced Forward Link Triangulation**
**E-OTD**
**Enhanced Observed Time Difference**
**RSS**
**Received Signal Strength**
**TDOA**
**Time Difference of Arrival**
**TOA**
**Time of Arrival**

## LOCATION SOLUTION “FAMILY TREE”

**“****Where are you?”**

**NETWORK**

**HANDSET**

**“****Fingerprint”**

**E-OTD (TDOA)**

**A-GPS**

**E-FLT**

**TDOA**
**+**
**AOA**

**TOA**

**TDOA**
**+**
**RSS**

**E-OTD**
**+**
**A-GPS**

**GPS**

**E-FLT**
**+**
**A-GPS**

## NETWORK BASED: TDOA

**Network impact**
**Location calculation and control**
**Network interconnection (digital systems)**
**Site impact**
**Location receivers**
**Handset impact**
**None**
**Systems addressed**
**Shipping product: AMPS**
**Announced product: [need data]**
**Under development: [need data]**
**Legacy handsets**
**Covered**

**TDOA: Time Difference of Arrival**
**Minimum of 3 sites measure arrival time of MS transmission**
**Location solution based on apparent arrival time differences between pairs of sites**

**Serving**
**Cell**

**Neighbor**
**Cell # 1**

**Neighbor**
**Cell # 2**

**MS**

**Location**
**Calc & Control**

**Location**
**Receivers**

## NETWORK BASED: AOA

_**NETWORK BASED: AOA**_

**Network impact**
**Network interconnection (digital systems)**
**Location calculation and control**
**Site impact**
**Location receivers**
**Additional antenna arrays plus cables**
**Handset impact**
**None**
**Systems addressed**
**Shipping product: [need data]**
**Announced product: [need data]**
**Under development: [need data]**
**Legacy handsets**
**Covered**

**Serving**
**Cell**

**Neighbor**
**Cell # 1**

**MS**

**Location**
**Receivers**

**Location**
**Calc & Control**

**AOA: Angle of Arrival**
**Minimum of 2 sites measure arrival angle of MS transmission**
**Location solution based on apparent signal arrival angle**

**Antenna**
**Array**

## NETWORK BASED: MULTIPATH FINGERPRINT

_**NETWORK BASED: MULTIPATH FINGERPRINT**_

**Network impact**
**Network interconnection (digital systems)**
**Location calculation and control**
**Site impact**
**Location receivers**
**Handset impact**
**None**
**Systems addressed**
**Shipping product: [need data]**
**Announced product: [need data]**
**Under development: [need data]**
**Legacy handsets**
**Covered**

**Serving**
**Cell**

**MS**

**Location**
**Receivers**

**Location**
**Calc & Control**

**Multipath Fingerprint**
**Minimum of 1 site measures attributes of received signal (i.e., “multipath fingerprint”)**
**Location solution based on matching of received signal fingerprint with predetermined location/fingerprint data base**

## HANDSET/NETWORK BASED: E-FLT

_**HANDSET/NETWORK BASED: E-FLT**_

**Network impact**
**Location calculation and control**
**Site impact**
**Calibration of site sync**
**Handset impact**
**None**
**Systems addressed**
**Shipping product: **
**Announced product: **
**Under development: CDMA**
**Legacy handsets**
**Covered**

**E-FLT: Enhanced Forward Link Triangulation**
**TDOA solution based on MS measurements**
**TOA ranging & coarse AOA via existing site antennas**
**CDMA unique solution**

**Serving**
**Cell**

**Neighbor**
**Cell # 1**

**Neighbor**
**Cell # 2**

**MS**

**Synchronized**
**Sites**

**Location**
**Calc & Control**

## HANDSET BASED: A-GPS

_**HANDSET BASED: A-GPS**_

**Network impact**
**GPS assist and location calculation**
**Site impact**
**Potential enhancements for non-synchronized systems**
**Handset impact**
**Second GPS antenna**
**GPS RF front end & processing**
**Memory**
**Software**
**Systems addressed**
**Shipping product: [need data]**
**Announced product: [need data]**
**Under development: [need data]**
**Legacy handsets**
**Not covered**

**A-GPS: Assisted Global Positioning System**
**Minimum of 1 site data link plus time of arrival (TOA) measurements to 3 GPS satellites (SV)**
**Location solution based on apparent TOA from GPS SVs**

**GPS Assist**
**&**
**Location Calc**

**Serving**
**Cell**

**MS**

**GPS**
**SV**

## HANDSET BASED: E-OTD

_**HANDSET BASED: E-OTD**_

**Network impact**
**Location calculation and/or control**
**Site impact**
**EITHER time synchronization enhancement**
**OR site time error measurement and calibration (LMU’s)**
**Handset impact**
**Memory**
**Software**
**Systems addressed**
**Shipping product: [need data]**
**Announced product: [need data]**
**Under development: GSM**
**Legacy handsets**
**Not covered**

**Serving**
**Cell**

**Neighbor**
**Cell # 1**

**Neighbor**
**Cell # 2**

**MS**

**Synchronized**
**Sites or LMUs**

**Location**
**Calc & Control**

**E-OTD: Enhanced Observed Time Difference**
**TDOA solution in handset**
**Arrival time of transmissions from a minimum of 3 sites **
**Location solution based on apparent arrival time differences between pairs of sites**

## COMPOSITE SYSTEMS

**AOA + RSS (Received Signal Strength)**
**AOA + TDOA**
**E-OTD + A-GPS**
**A-GPS + E-FLT**
**Other?**