Methods and apparatus for providing base station position information and using position information to support timing and/or frequency corrections
First Claim
1. A wireless terminal comprising:
- a receiver for receiving, over an airlink, a signal from a base station communicating a base station determined current base station position;
a relative distance determination module for determining the relative distance between the base station and the wireless terminal based on the communicated current base station position;
a timing synchronization module for performing a timing adjustment operation as a function of the determined relative distance;
a relative velocity determination module for determining the relative velocity of said wireless terminal relative to said base station;
a Doppler shift determination module coupled to said relative velocity determination module for outputting a Doppler shift correction signal, the Doppler shift correction signal based on the determined relative velocity of said wireless terminal relative to said base station; and
a combining module for generating uplink signals for transmission from said wireless terminal, the uplink signals comprising the Doppler shift correction signal based on the determined relative velocity of said wireless terminal relative to said base station combined with a baseband signal or a carrier frequency.
3 Assignments
0 Petitions
Accused Products
Abstract
A wireless terminal receives base station position over an airlink, determines its relative position with respect to the base station and determines a timing adjustment correction. The wireless terminal applies the determined timing correction to control uplink signaling timing and achieve synchronization at the base station'"'"'s receiver. The wireless terminal determines its relative velocity with respect to the base station and determines a Doppler shift adjustment which it adds to the uplink carrier frequency or to its baseband signal. A wireless terminal determines the position of a moving base station and determines timing and/or frequency corrections. Base station position is determined from the current time and stored information correlating the base station position with time, e.g., for a geo-synchronous satellite. Base station position information is determined from broadcast information, e.g., GPS base station position, for an aircraft base station. Wireless terminals may be mobile and include a GPS receiver for WIRELESS TERMINAL position determination.
34 Citations
50 Claims
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1. A wireless terminal comprising:
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a receiver for receiving, over an airlink, a signal from a base station communicating a base station determined current base station position; a relative distance determination module for determining the relative distance between the base station and the wireless terminal based on the communicated current base station position; a timing synchronization module for performing a timing adjustment operation as a function of the determined relative distance; a relative velocity determination module for determining the relative velocity of said wireless terminal relative to said base station; a Doppler shift determination module coupled to said relative velocity determination module for outputting a Doppler shift correction signal, the Doppler shift correction signal based on the determined relative velocity of said wireless terminal relative to said base station; and a combining module for generating uplink signals for transmission from said wireless terminal, the uplink signals comprising the Doppler shift correction signal based on the determined relative velocity of said wireless terminal relative to said base station combined with a baseband signal or a carrier frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A communications method comprising:
operating a first base station to; periodically transmit first base station identification information identifying the first base station; and periodically transmit, over an airlink, a signal communicating a first base station determined current base station position, to a wireless communication terminal, wherein a timing adjustment is made at the wireless communication terminal based on a distance between the first base station and the wireless communication terminal and a Doppler shift frequency adjustment at the wireless communication terminal is determined from the first base station determined current base station position, the Doppler shift frequency adjustment based on a determined relative velocity of said wireless communication terminal relative to said first base station, the wireless communication terminal generating uplink signals for transmission from the wireless communication terminal, the uplink signals comprising the Doppler shift frequency adjustment based on the determined relative velocity of said wireless communication terminal relative to said first base station combined with a baseband signal or a carrier frequency. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A wireless terminal comprising:
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means for receiving, over an airlink, a signal from a base station communicating a base station determined current base station position; means for determining the relative distance between the base station and the wireless terminal based on the communicated current base station position; means for performing a timing adjustment operation as a function of the determined relative distance; means for determining the relative velocity of said wireless terminal relative to said base station; means for outputting a Doppler shift correction signal, the Doppler shift correction signal based on the determined relative velocity of said wireless terminal relative to said base station; and means for generating uplink signals for transmission from said wireless terminal, the uplink signals comprising the Doppler shift correction signal being based on the determined relative velocity of said wireless terminal relative to said base station combined with a baseband signal or a carrier frequency. - View Dependent Claims (38, 39)
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40. A method of operating a wireless terminal, comprising:
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receiving, over an airlink, a signal from a base station communicating a base station determined current base station position; determining the relative distance between the base station and the wireless terminal based on the communicated current base station position; performing a timing adjustment operation as a function of the determined relative distance; determining the relative velocity of said wireless terminal relative to said base station; outputting a Doppler shift correction signal, the Doppler shift correction signal being based on the determined relative velocity of said wireless terminal relative to said base station; and generating uplink signals for transmission from said wireless terminal, the uplink signals comprising the Doppler shift correction signal based on the determined relative velocity of said wireless terminal relative to said base station combined with a baseband signal or a carrier frequency. - View Dependent Claims (41, 42)
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43. A non-transitory machine readable medium for use in a wireless terminal, the non-transitory machine readable medium including executable instructions which when executed by a processor, control said wireless terminal to:
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receive, over an airlink, a signal from a base station communicating a base station determined current base station position; determine the relative distance between the base station and the wireless terminal based on the communicated current base station position; perform a timing adjustment operation as a function of the determined relative distance; determine the relative velocity of said wireless terminal relative to said base station; output a Doppler shift correction signal, the Doppler shift correction signal being based on the determined relative velocity of said wireless terminal relative to said base station; and generate uplink signals for transmission from said wireless terminal, the uplink signals comprising the Doppler shift correction signal based on the determined relative velocity of said wireless terminal relative to said base station combined with a baseband signal or a carrier frequency.
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44. A first base station, comprising:
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a transmitter configured to periodically transmit first base station identification information identifying the first base station; and a base station position signaling module for controlling the first base station to periodically transmit, over an airlink, a signal communicating a first base station determined current base station position, to a wireless communication terminal, wherein a timing adjustment is made at the wireless communication terminal based on a distance between the first base station and the wireless communication terminal and a Doppler shift frequency adjustment at the wireless communication terminal is determined from the first base station determined current base station position, the Doppler shift frequency adjustment based on a determined relative velocity of said wireless communication terminal relative to said first base station, the wireless communication terminal generating uplink signals for transmission from the wireless communication terminal, the uplink signals comprising the Doppler shift frequency adjustment based on the determined relative velocity of said wireless communication terminal relative to said first base station combined with a baseband signal or a carrier frequency. - View Dependent Claims (45, 46)
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47. A first base station, comprising:
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means for transmitting configured to periodically transmit first base station identification information identifying the first base station; and means for controlling the first base station to periodically transmit, over an airlink, a signal communicating a first base station determined current base station position, to a wireless communication terminal, wherein a timing adjustment is made at the wireless communication terminal based on a distance between the first base station and the wireless communication terminal and a Doppler shift frequency adjustment at the wireless communication terminal is determined from the first base station determined current base station position, the Doppler shift frequency adjustment based on a determined relative velocity of said wireless communication terminal relative to said first base station, the wireless communication terminal generating uplink signals for transmission from the wireless communication terminal, the uplink signals comprising the Doppler shift frequency adjustment based on the determined relative velocity of said wireless communication terminal relative to said first base station combined with a baseband signal or a carrier frequency. - View Dependent Claims (48, 49)
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50. A non-transitory machine readable medium for use in a base station, the non-transitory machine readable medium including executable instructions which when executed by a processor, control said base station to:
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periodically transmit base station identification information identifying the base station; and periodically transmit, over an airlink, a signal communicating a base station determined current base station position, to a wireless communication terminal, wherein a timing adjustment is made at the wireless communication terminal based on a distance between the base station and the wireless communication terminal and a Doppler shift frequency adjustment at the wireless communication terminal is determined from the base station determined current base station position, the Doppler shift frequency adjustment based on a determined relative velocity of said wireless communication terminal relative to said base station, the wireless communication terminal generating uplink signals for transmission from the wireless communication terminal, the uplink signals comprising the Doppler shift frequency adjustment based on the determined relative velocity of said wireless communication terminal relative to said base station combined with a baseband signal or a carrier frequency.
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Specification