The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 2011
Filed:
Sep. 04, 2007
Tetsuya Ito, Tokyo, JP;
Jun Hasegawa, Kyoto, JP;
Satoko Itaya, Kyoto, JP;
Akira Matsumoto, Tokyo, JP;
Hiroyuki Iizuka, Tokyo, JP;
Yuichiro Ezure, Tokyo, JP;
Akio Hasegawa, Kyoto, JP;
Peter Davis, Kyoto, JP;
Naoto Kadowaki, Kyoto, JP;
Sadao Obana, Kyoto, JP;
Tetsuya Ito, Tokyo, JP;
Jun Hasegawa, Kyoto, JP;
Satoko Itaya, Kyoto, JP;
Akira Matsumoto, Tokyo, JP;
Hiroyuki Iizuka, Tokyo, JP;
Yuichiro Ezure, Tokyo, JP;
Akio Hasegawa, Kyoto, JP;
Peter Davis, Kyoto, JP;
Naoto Kadowaki, Kyoto, JP;
Sadao Obana, Kyoto, JP;
NEC Communication Systems, Ltd., Tokyo, JP;
Advanced Telecommunications Research Institute International, Kyoto, JP;
Abstract
The route maintenance unit outputs a period setting request to the period setting unit when the communication unit normally receives a Hello packet for the first time. The period setting unit sets a link connection confirmation period in response to the period setting request and outputs the set period to the route maintenance unit. The route maintenance unit maintains a radio link between the radio device in which the route maintenance unit is provided and an adjacent device upon receiving a data packet other than a Hello packet from the adjacent radio device even if a Hello packet is not received in the link connection confirmation period. Consequently, route disconnection or switching occurs less often.