Patent ID: 7107056

Claim:
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.