Navigation assistance for call handling in mobile telephone systems
AssigneeEricsson Inc.
InventorPaul W. Dent
Life of this patent
Estimating the term…
Abstract
In a mobile radio telephone system employing TDMA or CDMA, mobile units often must determine the timing and appropriate power necessary for transmissions to a base station. Information broadcast by base stations allows the mobile station to approximate its distance from each base station based on an average signal strength received and thereby determine the coarse sector location. Broadcast information may include the mean radial distribution of signal strength versus distance. From the broadcast information, the mobile station determines the propagation loss for a transmission to the base station and the appropriate power level and timing for transmissions. Accordingly, the mobile station transmits signals to the base station at the determined signal timing and power level.
Claims20
A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising:
- receiving at said mobile station a signal from at least one of said fixed stations;
- decoding said signal to obtain broadcast information;
- measuring the signal strength of said signal received from said at least one fixed station;
- averaging said measured signal strength to produce an average signal strength value;
- estimating a propagation loss from said mobile station to said at least one fixed station using said average signal strength value and said broadcast information;
- and
- estimating an appropriate transmitter power level for said mobile station to use in making a first transmission to said at least one fixed station using said estimated propagation loss.
A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising:
- receiving at said mobile station a first signal from a first of said fixed stations;
- measuring signal strength of said first signal from said first fixed station;
- receiving at said mobile station at least a second signal from at least one other fixed station;
- measuring signal strength of said at least said second signal;
- estimating a propagation loss from said mobile station to said first fixed station using said signal strength measurements;
- and
- estimating an appropriate transmitter power for said mobile station to use in making a first transmission to said first fixed station using said estimated propagation loss.
A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising:
- receiving at said mobile station a signal from at least one of said plurality of fixed stations;
- decoding said signal to obtain broadcast information;
- measuring signal strength of said signal received from said at least one fixed station;
- averaging said measured signal strength to produce an average signal strength value;
- and
- estimating a propagation delay from said mobile station to said at least one fixed station using said average signal strength value and said decoded broadcast information, and thereby an appropriate transmitter timing for said mobile station to use in making a first transmission to said at least one fixed station.
A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising:
- receiving at said mobile station a first signal from a first of said plurality of fixed stations;
- measuring signal strength of said first signal;
- receiving at said mobile station at least one second signal from at least one other fixed station;
- measuring signal strength of said at least one second signal;
- and
- estimating a propagation delay from said mobile station to said first fixed station using said signal strength measurements and thereby an appropriate transmitter timing for said mobile station to use in making a first transmission to said first fixed station.
A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising:
- receiving at said mobile station a first signal from a first of said fixed stations;
- measuring signal timing of said first signal from said first fixed station;
- receiving at said mobile station at least one second signal from at least one other fixed station;
- measuring signal timing of said at least one second signal;
- and
- estimating a propagation delay from said mobile station to said first fixed station using said signal timing measurements and thereby an appropriate transmitter timing for said mobile station to use in making a first transmission to said first fixed station.
A method of establishing communications between a mobile radio station and at least one of a network of fixed stations, said method comprising:
- receiving at said mobile station a first signal from a first of said fixed stations;
- measuring signal timing of said first signal;
- receiving at said mobile station at least one second signal from at least one other fixed station;
- measuring signal timing of said at least one second signal;
- and
- estimating a propagation loss from said mobile station to said first fixed station using said signal timing measurements and thereby an appropriate transmitter power for said mobile station to use in making a first transmission to said first fixed station.
A method of establishing communications between a mobile radio station and at least one of a plurality of fixed stations, said method comprising:
- receiving at said mobile station a first signal from a first of said fixed stations;
- measuring signal strength and timing of said first signal from said first fixed station;
- receiving at said mobile station at least one second signal from at least one other fixed station;
- measuring signal strength of said at least one second signal from at least one other fixed station;
- estimating a propagation delay from said mobile station to said first fixed station using said signal strength measurements;
- and
- determining an appropriate transmitter timing for said mobile station to use in making a first transmission to said first fixed station using both said propagation delay estimate and said timing measurement.
A method of establishing communications between a mobile station and at least one of a plurality of fixed stations, said method comprising the steps of:
- receiving at said mobile station signals from at least a first, second and third of said fixed stations and making timing measurements on said signals;
- and
- combining said timing measurements to estimate a transmitter timing for said mobile station to use in making a first transmission to said first fixed station.
A method of controlling transmitter power for transmitting from a mobile station to a plurality of fixed stations, said method comprising:
- receiving at said mobile station a signal transmitted from a first of said fixed stations;
- measuring signal strength of said first signal from said first fixed station;
- receiving at said mobile station at least one second signal transmitted from at least one other fixed station;
- measuring signal strength of said at least one second signal from at least one other fixed station;
- determining an appropriate transmitter power for said mobile station to use for transmitting to said plurality of fixed stations using a combination of said signal strength measurements;
- and
- controlling the transmitter power of said mobile station at the determined level.
Dependencies are inferred from the claim text.