公开(公告)号：JP2006186551A

公开(公告)日：2006-07-13

申请号：JP2004376629

申请日：2004-12-27

Applicant: ATR ADVANCED TELECOMM RES INST

Inventor： NOTO HIROYUKI ,  HASEGAWA AKIO ,  TANAKA SHINSUKE ,  KADOWAKI NAOTO ,  OBANA SADAO

IPC: H04W84/12

Abstract: PROBLEM TO BE SOLVED: To provide a radio device which determines the position of a newly added radio device to a plurality of communication ranges or a plurality of radio devices among the plurality of the radio devices and the newly added radio device. SOLUTION: Three time differences are calculated between the propagation period which a beacon frame propagates from the radio device 10 to the radio devices 20, 30, and 40 and the propagation period which the beacon frame propagates from the radio device 10 to the radio devices 50. Moreover, three time lengths are detected after the three radio devices 20, 30, and 40 receive the beam frame from the radio device 10 until it receives the data frame from the radio device 50. Three communication ranges d D2 , d D3 , and d D4 among the radio device 50 and the three radio devices 20, 30, and 40 are determined based on the three time differences, the three time lengths and a response time in the radio device 50. COPYRIGHT: (C)2006,JPO&NCIPI

公开(公告)号：JP2006186603A

公开(公告)日：2006-07-13

申请号：JP2004377339

申请日：2004-12-27

Applicant: ATR ADVANCED TELECOMM RES INST

Inventor： JACIR LUIZ BORDIM ,  THOMAS HUNZIKER ,  UEDA TETSUO ,  TANAKA SHINSUKE ,  NAKANO KOJI

IPC: H04B7/26

Abstract: PROBLEM TO BE SOLVED: To provide a wireless device capable of constituting a wireless network by which further higher throughput can be obtained. SOLUTION: The wireless device has a control channel and a data channel. The wireless device transmits a communication request RTS to a transmission destination with an omnidirectional beam pattern by using the control channel, and establishes a wireless communication route in-between a reception destination by receiving communication permission CTS from the transmission destination while changing a beam pattern of an antenna into a plurality of beam patterns. When the wireless communication route is established in between the transmission destination, the wireless device transmits data DATA to the transmission destination via the data channel different from the control channel by using a beam pattern, in which radio field intensity is maximum when receiving the communication permission CTS, and receives an acknowledgement ACK from the transmission destination. COPYRIGHT: (C)2006,JPO&NCIPI