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:
Jan. 10, 2012
Filed:
Nov. 13, 2008
Hyung Joo Ki, Suwon-si, KR;
Sueng Jae Bae, Suwon-si, KR;
Min Young Chung, Seoul, KR;
Tae Jin Lee, Suwon-si, KR;
Hyung Joo Ki, Suwon-si, KR;
Sueng Jae Bae, Suwon-si, KR;
Min Young Chung, Seoul, KR;
Tae Jin Lee, Suwon-si, KR;
Sungkyunkwan University Foundation for Corporate Collaboration, Kyonggi-do, KR;
Abstract
Disclosed is a method of recognizing an available channel in order to prevent channel occupation requirements from colliding with each other when one wireless channel is shared by plural terminals in a CSMA/CA mechanism using an IEEE 802.15.4 protocol slot, the method including: a first step of initializing a counter, CW, as 2, the CW being used for CCA which an attempt to perform is made before frame transmission; a second step of determining if a required channel is occupied; a third step of decreasing the CW by 1 when the channel is idle in the second step; a fourth step of re-determining if the channel is occupied; and a fifth step of, based on a determination result in the fourth step, determining if the CW is 1 when the channel is occupied.