WIRELESS APPARATUS, WIRELESS COMMUNICATION NETWORK WITH THE SAME AND METHOD OF DETECTING CHANNEL IN WIRELESS APPARATUS

Japanese Patent JP2008061227

A

To provide a wireless apparatus which practically detects a crowded channel even when used in an ad-hoc network.

Each wireless apparatus 31 to 43 holds a table indicating a relation between a failure probability P that a wireless apparatus around itself fails in packet transmission to itself and the number N of wireless apparatuses simultaneously accessing to itself. The wireless apparatus 36 detects a time interval between occurrences of packet loss when receiving a Hello packet periodically transmitted from a wireless apparatus around itself at a channel Chj, and calculates the failure probability that a wireless apparatus around itself fails in packet transmission to itself based on the detected time interval, and detects the number N of a wireless apparatus corresponding to the calculated failure probability with reference to the table. The wireless apparatus 36 determines that the channel Chj is a crowded channel when the detected number N of a wireless apparatus is more than a reference value.

ITAYA SATOKO
HASEGAWA ATSUSHI
KONDO YOSHIHISA
PETER DAVIS
KADOWAKI NAOTO
OBANA SADAO
YAMAGUCHI SHINJI
SUZUKI RYUTARO

JP2007191645A

March 13, 2008

July 24, 2007

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ATR ADVANCED TELECOMM RES INST

H04B7/26; H04L12/28; H04L12/701; H04W16/26; H04W24/08; H04W40/28; H04W40/34; H04W74/08; H04W84/12; H04W84/18

JP2005333510A	2005-12-02
JP2005159488A	2005-06-16
JP2005244312A	2005-09-08
JP2006319676A	2006-11-24
JP2006311495A	2006-11-09
JP2004357213A	2004-12-16
JP2006042392A	2006-02-09

Takao Matsuyama

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