초록 ▼

A method and an apparatus is provided for acquiring satellite signals to establish the exact spatial position of a cellular radiotelephone, in order to perform a timely dropoff or smooth handoff to another base station or frequency. The cellular radiotelephone is equipped with its own positioning sy

A method and an apparatus is provided for acquiring satellite signals to establish the exact spatial position of a cellular radiotelephone, in order to perform a timely dropoff or smooth handoff to another base station or frequency. The cellular radiotelephone is equipped with its own positioning system which uses satellite data to determine its spatial position. The communication system is preferably a Code Division Multiple Access (CDMA) system, and the positioning system is preferably a Global Positioning System (GPS). The method of the present invention may be used to determine the base station closest to the cellular radiotelephone. In the alternative, it may be used to compute a distance between the cellular radiotelephone and a location where the quality level of the cellular radiotelephone communication signal is predicted to be less than the predetermined value, and to determine from the computed distance whether the cellular radiotelephone should be handed off.

대표청구항 ▼

[ What is claimed is:] [1.]1. A communication system, comprising:one or more radiotelephones;a plurality of base stations for transmitting communication signals to and receiving communication signals from the radiotelephones;a positioning system in at least one of the radiotelephones for determining

[ What is claimed is:] [1.]1. A communication system, comprising:one or more radiotelephones;a plurality of base stations for transmitting communication signals to and receiving communication signals from the radiotelephones;a positioning system in at least one of the radiotelephones for determining the spatial position of the radiotelephone;wherein one of the base stations performs a dropoff of the radiotelephone containing the positioning system when the quality of the radiotelephone communication signal is predicted to be less than a predetermined value based on the spatial position of the radiotelephone, the radiotelephone being dropped from the communication system when the base station performs the dropoff;the positioning system uses GPS satellite signals to determine spatial position;the radiotelephone further comprises:a data storage area for storing ephemeris data of the GPS satellites;a clock synchronized with one of the GPS satellites;a code storage area including software programs; anda microprocessor for executing the software programs.