A-GPS Assistance Network Delay Modeling and Estimation Over Mobile Networks

G. Huang, D. Akopian

Abstract:	Assisted Global Positioning System (A-GPS) is the proposed scheme to help stand-alone receivers operating under weak signal environments. It utilizes wireless network as a terrestrial network channel to deliver orbital parameters, coarse time, and location references known as assistance data. As the network channel is a main factor of A-GPS support, statistic models of delays occurring in assistance data delivery process should be properly studied to support sufficient scenarios. This paper presents a methodology of assistance delay estimation and modeling for A-GPS mobile devices that is applicable to various simulation environments. It demonstrates a Mobile Station (MS) based testbed that exploits the standardized communication architecture as a data channel, Secure User Plane Location (SUPL), to deliver A-GPS assistance data. Measurement campaigns are conducted and network delay models are derived for various representative distances based on various mobile networks, such as third-generation mobile telecommunication (3G), high-speed downlink packet access (HSDPA), and fourth-generation Long Term Evolution (4G LTE), via the Transmission Control Protocol and the Internet Protocol (TCP/IP) connection between an A-GPS server and a receiver.
Published in:	Proceedings of the 26th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2013) September 16 - 20, 2013 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	1944 - 1950
Cite this article:	Huang, G., Akopian, D., "A-GPS Assistance Network Delay Modeling and Estimation Over Mobile Networks," Proceedings of the 26th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2013), Nashville, TN, September 2013, pp. 1944-1950.
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