Navigation assistance for call handling in mobile telephone systems
First Claim
1. In a multiple access, spread spectrum communications system, a method for establishing communications between a mobile station and at least one base station, said method including the steps of:
- broadcasting a signal to said mobile station from at least one base station wherein the broadcast signal from said at least one base station includes data;
receiving at said mobile station the broadcast signal of said at least one base station;
determining a mean signal strength for said received broadcast signal; and
estimating a distance between the mobile station and said at least one base station based on said data and said mean signal strength of said received broadcast signal.
3 Assignments
0 Petitions
Accused Products
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.
276 Citations
26 Claims
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1. In a multiple access, spread spectrum communications system, a method for establishing communications between a mobile station and at least one base station, said method including the steps of:
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broadcasting a signal to said mobile station from at least one base station wherein the broadcast signal from said at least one base station includes data; receiving at said mobile station the broadcast signal of said at least one base station; determining a mean signal strength for said received broadcast signal; and estimating a distance between the mobile station and said at least one base station based on said data and said mean signal strength of said received broadcast signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. In a multiple access, spread spectrum communications system, a method for establishing communications between a mobile station and a base station including the steps of:
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broadcasting a signal to said mobile station from a first base station wherein said first base station broadcast signal includes first information containing a signal strength profile at different distances from said first base station in a broad direction of a second base station; broadcasting a signal to said mobile station from said second base station wherein said second base station broadcast signal includes second information containing a signal strength profile at different distances from said second base station in a broad direction of said first base station; measuring mean signal strengths of said first base station broadcast signal and said second base station broadcast signal; determining whether a beating of the mobile station from said first base station is in a broad direction of said second base station based on said first information, said second information, and the measured mean signal strengths; and estimating a distance from said mobile station to said first base station using said first base station signal strength profile if the bearing is in the broad direction of the second base station. - View Dependent Claims (15)
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16. In a multiple access, spread spectrum communications system, a method for establishing communications between a mobile station and a base station assigned to said mobile station including the steps of:
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receiving at the mobile station broadcast signals from the assigned base station; measuring a received signal strength of the broadcast signals; estimating a position of the mobile station based on the received signal strength; and determining an appropriate timing advance for signal transmission from the mobile station to the assigned base station according to the estimated position. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. In a multiple access, spread spectrum communications system, a method for establishing communications between a mobile station and a base station assigned to said mobile station including the steps of:
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broadcasting signals from neighboring base stations and the assigned base station, said broadcast signals including bearing information; receiving the broadcast signals at said mobile station; calculating a beating of said assigned base station and said neighboring base stations with respect to the mobile station based on the broadcast signals; estimating distance from the mobile station to the assigned base station and a signal timing for transmitting a signal from said mobile station to said assigned base station according to said calculated bearings; and transmitting said signal from said mobile station to said assigned base station with said estimated signal timing. - View Dependent Claims (25, 26)
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Specification