TIME-BASED EPHEMERIS IDENTITY IN ASSISTANCE DATA AND ASSISTANCE DATA REQUEST MESSAGES

摘要

A module (software or ASIC) for use in a serving mobile Location Centre (SMLC) or a mobile station having a GPS receiver (or an A-GPS receiver) for determining an ITOW for a CNAV-1 signal. Also provided is a module for a mobile with GPS (or A-GPS receiver) so that the mobile can use the ITOW (either the ITOW provided with the CNAV-2, or that calculated for the CNAV-1) to uniquely identify ephemeris information in a request for assistance message. Also provided is a module for a SMLC by which the SMLC can use the IOD fields in the assistance data messages in a way that uniquely identifies the associated ephemeris information.