Observed Time Difference Of Arrival (OTDOA) Positioning in LTE

Its been a while I wrote anything on Positioning. The network architecture for the positioning entities can be seen from my old blog post here. 

Qualcomm has recently released a whitepaper on the OTDOA (Observed Time Difference Of Arrival) positioning. Its quite a detailed paper with lots of technical insights.

There is also signalling and example of how reference signals are used for OTDOA calculation. Have a look at the whitepaper for detail, embedded below.

Observed Time Difference Of Arrival (OTDOA) Positioning in 3GPP LTE from Zahid Ghadialy

Location Services in LTE Networks

Recently made a combined architecture of LTE with LCS and MBMS and posted it here. This document from MSF below looks at the LoCation Services (LCS) in detail.

MSF Whitepaper on Location Services in LTE Networks

View more documents from Zahid Ghadialy

Updated LTE Architecture with LCS and MBMS entities

Here is an attempt to update the LTE Architecture with MBMS and Location Services (LCS) entities included

You can also refer to the following old posts:

• Simplifying LTE/SAE Interfaces
• 3GPP Official 'MBMS support in E-UTRAN' - Mar 2011
• MBMS in LTE Release-9

Couple of presentations on GNSS and LCS

I came across couple of presentations from International Conference on Localization and GNSS, held in Tampere, Finland, June 29-30, 2011

This first presentation by Lauri Wirola of Nokia gives good summary of standardized positioning technologies in use today. It also lists the difference between control plane and user plane positioning. The 3GPP based positioning from Rel 5 to Rel 8 has been listed. Overall a very interesting presentation.

Location Standards driving the mass market LCS adoption

View more presentations from Zahid Ghadialy

The second presentation by Ignacio Fernández Hernández of the European Commission, gives an overview of the EU satnav programmes (Galileo, EGNOS) and current R&D status; Present some numbers and findings of the overall GNSS R&D panorama in EU and abroad; Present some trends and challenges in location technologies for the following years. Another interesting presentation I think.

GNSS Programmes and R&D landscape in the EU

View more presentations from Zahid Ghadialy