Method and system for estimating movement speed of mobile unit
First Claim
1. A method for estimating a movement speed of a mobile unit in a mobile radio communication system, comprising:
- (A) receiving a signal corresponding to a mobile unit transmitting signal;
(B) generating a first signal by using a first filter unit to filter said signal, said first filter unit having a first cut-off frequency;
(C) obtaining a first speed by estimating said movement speed based on said first signal;
(D) generating a second signal by using a second filter unit to filter said signal, said second filter unit having a second cut-off frequency, said second cut-off frequency being lower than said first cut-off frequency;
(E) obtaining a second speed by estimating said movement speed based on said second signal;
(F) selecting one of said first speed and said second speed to be said movement speed; and
(G) selecting said second speed as said movement speed if said first speed is slower than a predetermined speed.
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Abstract
The present invention is related to a method for estimating a movement speed of a mobile unit in a mobile radio communication system. First, a signal from the mobile unit is received. Then, a first signal is generated by using a first filter having a first cut-off frequency to filter the signal. A first speed is obtained based on the first signal. A second signal is further generated by using a second filter having a second cut-off frequency to filter the signal. A second signal is obtained based on the second signal. Then the movement speed of the mobile unit is determined according to the first speed and the second speed.
17 Citations
16 Claims
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1. A method for estimating a movement speed of a mobile unit in a mobile radio communication system, comprising:
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(A) receiving a signal corresponding to a mobile unit transmitting signal; (B) generating a first signal by using a first filter unit to filter said signal, said first filter unit having a first cut-off frequency; (C) obtaining a first speed by estimating said movement speed based on said first signal; (D) generating a second signal by using a second filter unit to filter said signal, said second filter unit having a second cut-off frequency, said second cut-off frequency being lower than said first cut-off frequency; (E) obtaining a second speed by estimating said movement speed based on said second signal; (F) selecting one of said first speed and said second speed to be said movement speed; and (G) selecting said second speed as said movement speed if said first speed is slower than a predetermined speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16)
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10. A system for estimating a movement speed of a mobile unit, comprising:
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a receiving unit for receiving a signal corresponding to a transmitting signal of said mobile unit; a first filter unit for filtering said signal to generate a first signal, said first filter unit having a first cut-off frequency, said first filter unit corresponding to a first speed zone; a second filter unit for filtering said signal to generate a second signal, said second filter unit having a second cut-off frequency, said second filter unit corresponding to a second speed zone, a predetermined speed being located between a lower edge of the first of the first speed zone and a higher edge of the second speed zone; an estimated unit for obtaining a first speed by estimating said movement speed based on said first signal, and obtaining a second speed by estimating said movement speed based on said second signal; and a selecting unit for selecting said second speed as said movement speed if said first speed is slower than said predetermined speed.
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Specification