Patent ID: 8948035
Filing Date: 2015-02-03
Classification: H04W

Abstract:
1. A wireless base station communicating with a plurality of wireless terminals by an Orthogonal Frequency-Division Multiplexing (OFDM) scheme or Orthogonal Frequency-Division Multiple Access (OFDMA) scheme, comprising: an identification unit at the wireless base station that allows the wireless base station to calculate a moving speed of a wireless terminal currently in communication, a ranging control unit setting a transmission cycle of a ranging signal of a wireless terminal moving at a speed greater than or equal to a predetermined speed shorter than the transmission cycle of a ranging signal of a wireless terminal moving at a speed below said predetermined speed so that an amount of frames for a ranging cycle for the terminal moving at a speed greater than or equal to a predetermine speed is reduced relative to an amount of frames for a ranging cycle of a ranging signal of a wireless terminal moving at a speed below said predetermined speed, a transmission unit transmitting a signal notifying said set ranging signal transmission cycle to said wireless terminal, and a reception unit receiving a ranging signal from a wireless terminal currently in communication.