Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Practical Network-Based Techniques for Mobile Positioning in UMTS | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article iD 12930 Pages 1-15 DOI ASP 2006 12930 Practical Network-Based Techniques for Mobile Positioning in UMTS Jakub Borkowski and Jukka Lempiainen Institute of Communications Engineering Tampere University of Technology . Box 553 33101 Tampere Finland Received 1 June 2005 Revised 9 May 2006 Accepted 18 May 2006 This paper presents results of research on network-based positioning for UMTS universal mobile telecommunication system . Two new applicable network-based cellular location methods are proposed and assessed by field measurements and simulations. The obtained results indicate that estimation of the position at a sufficient accuracy for most of the location-based services does not have to involve significant changes in the terminals and in the network infrastructure. In particular regular UMTS terminals can be used in the presented PCM pilot correlation method while the other proposed method - the ECID RTT cell identification round trip time requires only minor software updates in the network and user equipment. The performed field measurements of the PCM reveal that in an urban network 67 of users can be located with an accuracy of 70 m. In turn simulations of the ECID RTT report accuracy of 60 m-100 m for 67 of the location estimates in an urban scenario. Copyright 2006 J. Borkowski and J. Lempiainen. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION An ultimate aim of the mobile positioning research is to find a method providing high estimation accuracy to the user with minimum delay and at minimum cost. Development of location techniques towards defined performance objectives is pushed by the perspective of high revenues through enabling attractive location-sensitive applications .
