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Á¦°³Á¤ÀÏ 2012-12-21 ÃÑÆäÀÌÁö 20
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¿µ¹®Ç¥Áظí Requirements for Wireless Multi-hop Data Communication in Large-scale CPS
Çѱ۳»¿ë¿ä¾à º» Ç¥ÁØÀº µ¥ÀÌÅÍ ¼öÁýÀ» À§ÇØ Æ®¸® ÇüÅ·Π±¸¼ºµÈ ´ë±Ô¸ð ¹«¼± ¸ÖƼȩ ³×Æ®¿öÅ©¿¡¼­ ä³Î È¥ÀâÀ» ÇÇÇÏ°í µ¥ÀÌÅÍ Åë½ÅÀÇ ½Å·Ú¼ºÀ» È®º¸Çϱâ À§ÇÑ ¿ä±¸ »çÇ׿¡ °üÇÑ °ÍÀÌ´Ù. ÀÌ ¶§ ¹«¼± ¸ÖƼȩ ³×Æ®¿öÅ©¶õ ¼Ò¼öÀÇ ¹éº» ¶ó¿ìÅÍ(·çÆ® µð¹ÙÀ̽º ȤÀº ½ÌÅ© ³ëµå)µé·Î ³×Æ®¿öÅ©¿¡¼­ ¹ß»ýÇÑ µ¥ÀÌÅÍ°¡ ¼öÁýµÇ´Â Æ®¸® ÇüÅÂÀÇ ³×Æ®¿öÅ©¸¦ ¸»Çϸç, ÈçÈ÷ ¸»ÇÏ´Â ¼¾¼­ ³×Æ®¿öÅ©°¡ ÀÌ¿¡ ¼ÓÇÑ´Ù. ÀÌ·¯ÇÑ ´ë±Ô¸ð ¹«¼±¸Á¿¡¼­ CMSA/CA ±â¹ýÀ» »ç¿ëÇØ µð¹ÙÀ̽º °£ Åë½ÅÀ» ÇÏ´Â °æ¿ì, Àº´ÐµÈ ³ëµå ¹®Á¦(Hidden Node Problem)·Î ÀÎÇÏ¿© Åë½Å ½Å·Ú¼ºÀÌ ¸Å¿ì ³·¾ÆÁö°Ô µÈ´Ù. º» Ç¥ÁØÀº ÀÌ·¯ÇÑ ¹®Á¦Á¡À» ÇØ°áÇÏ°í Åë½Å ½Å·Ú¼ºÀ» ³ôÀ̱â À§ÇØ ¿ä±¸µÇ´Â »çÇ׵鿡 ´ëÇÑ °ÍÀÌ´Ù.
¿µ¹®³»¿ë¿ä¾à A sensor network which is one of typical wireless multi-hop network has a tree network topology, which consists of a lot of general devices producing data and a few back-bone routers (root devices or sink nodes) gathering data from general devices. In this network, Hidden node problem lowers the reliability of data communication seriously even if CSMA/CA algorithm is adapted because each device has many neighborhoods. This standard provides requirements to prohibit channel congestion and to acquire high-reliability for data communication in wireless multi-hop networks.
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