Method of measuring speed of a mobile unit and a receiver for use in a wireless communication system
First Claim
1. A method of measuring speed of a mobile unit in communication with a wireless communication system, the wireless communication system comprising a switch and a base station in communication with the switch, the method comprising the steps of:
- receiving a radio frequency, RF, signal from the mobile unit;
measuring signal quality of the RF signal during a first time period to produce a first group of samples;
sampling the received quality signal during a first time period and at a first sampling rate to produce a first group of samples;
sampling a received quality signal during a second time period and at a second sampling rate to produce a second group of samples;
calculating a variation in signal quality of the RF signal in response to the first and second group of samples;
determining a speed measurement in response to the variation in signal quality; and
the base station directing to the switch a plurality of handoff requests at a timing rate, the timing rate adjusted based on the speed measurement.
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Accused Products
Abstract
A method of measuring speed of a mobile unit for use in a wireless communication system 20. The method includes the steps of receiving a radio frequency (RF) signal from the mobile unit 202, measuring signal quality of the RF signal to produce a received quality signal 204, sampling the received quality signal during a first time period to produce a first group of samples 206, sampling the received quality signal during a second time period to produce a second group of samples 208, calculating a variation in signal quality of the RF signal in response to the first and second group of samples 210, and determining a speed measurement in response to the variation in signal quality 212.
86 Citations
16 Claims
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1. A method of measuring speed of a mobile unit in communication with a wireless communication system, the wireless communication system comprising a switch and a base station in communication with the switch, the method comprising the steps of:
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receiving a radio frequency, RF, signal from the mobile unit; measuring signal quality of the RF signal during a first time period to produce a first group of samples; sampling the received quality signal during a first time period and at a first sampling rate to produce a first group of samples; sampling a received quality signal during a second time period and at a second sampling rate to produce a second group of samples; calculating a variation in signal quality of the RF signal in response to the first and second group of samples; determining a speed measurement in response to the variation in signal quality; and the base station directing to the switch a plurality of handoff requests at a timing rate, the timing rate adjusted based on the speed measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A receiver in a wireless communication system comprising:
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an antenna receiving a radio frequency signal; a radio frequency stage receiving the radio frequency signal and producing a measured quality signal; a processor responsive to the radio frequency stage, the processor including a memory having a speed measurement routine; a handoff controller responsive to said processor; said processor when executing said speed measurement routine; sampling the measured quality signal at a first sampling rate to produce a first group of samples; sampling the measured quality signal at a second sampling rate to produce a second group of samples; calculating an average fade depth of the first and second group of samples; determining a speed measurement based on the average fade depth of the first and second group of samples; and said handoff controller initiating handoff requests based on the speed measurement.
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16. A wireless communication system comprising:
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a base station including a receiver comprising; an antenna receiving a radio frequency signal; a radio frequency stage receiving the radio frequency signal and producing a measured quality signal; a processor responsive to the radio frequency stage, the processor including a memory having a speed measurement routine; said processor when executing said speed measurement routine; sampling the measured quality signal at a first sampling rate to produce a first group of samples; sampling the measured quality signal at a second sampling rate to produce a second group of samples; calculating an average fade depth of the first and second group of samples; and determining a speed measurement based on the average fade depth of the first and second group of samples; and a switching device responsive to the base station, the base station directing to the switching device a plurality of handoff requests at a timing rate, the timing rate adjusted based on the speed measurement.
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Specification