An Innovative Self-generated Assistance Technology for a High Sensitivity GPS Mobile Phone

K.S. Huang, C.T. Weng

Abstract:	A typical AGPS-enabled mobile phone will use a data connection (Internet or wireless-network) to contact the assistance server for obtaining AGPS assistance data. The assistance data are used to improve on the standard startup performance. In Assisted GPS (GNSS) system standard, 3GPP TS 34.171 [1], the specifications of max position responding time is 20 seconds (95% success rate), and signal acquisition sensitivity with fine-time assistance data is -147dBm. One of the major issues in the current AGPS-capable cellular phone is that the connection establishment process actually spends several seconds as it creates a connection suitable for data exchange. It is strongly depends on network quality and reliability. However, users need an option of falling back to standalone devices when the network is not available. Furthermore, without relying on network assistance, the benefit is the cost saving of data exchange and network maintenance. This paper proposes a method of selfgenerated assistance data technology for a standalone mobile terminal which equipped with a high sensitivity GNSS receiver. Without download assistant data from network, the self-generated assistance data helps the GNSS receiver acquire signal faster in a signal weakness zone and obtain position fix as well. With this new technology, position responding time or Time to First Fix (TTFF) was greatly reduced to only 5 seconds and satellite signal acquisition sensitivity was improved to - 160dBm. The improvements are very helpful for a mobile phone user to get better experience with location based applications in any GPS signal environments.
Published in:	Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010) September 21 - 24, 2010 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2981 - 2985
Cite this article:	Huang, K.S., Weng, C.T., "An Innovative Self-generated Assistance Technology for a High Sensitivity GPS Mobile Phone," Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010), Portland, OR, September 2010, pp. 2981-2985.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In