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ÇѱÛÇ¥ÁØ¸í ·Îº¿ÀÇ À̵¿¼º¿¡ µû¸¥ IEEE 802.11 ¹«¼±·£ Åë½Å¼º´É ÃøÁ¤¹æ¹ý
¿µ¹®Ç¥Áظí Performance Evaluation Method for IEEE 802.11 Wireless LAN in Mobile Robots
Çѱ۳»¿ë¿ä¾à ´Ù¼öÀÇ AP°¡ ¹èÄ¡µÈ ±¤¿ª ȯ°æ¿¡¼­ ¿î¿ëµÇ´Â ·Îº¿ÀÇ IEEE 802.11 ¹«¼±·£ ¸ðµâÀº À̵¿¼º ¶§¹®¿¡ ÀûÀýÇÑ ¼öÁØÀÇ Åë½Å ¼º´ÉÀ» Ç×»ó À¯ÁöÇÒ ¼ö ÀÖ´Â °ÍÀº ¾Æ´Ï´Ù. ¿¹¸¦ µé¸é, ·Îº¿ÀÌ ÇöÀç Á¢¼Ó ÁßÀÎ AP·ÎºÎÅÍ Á¡Á¡ ¸Ö¾îÁ® ¼­ºñ½º ¿µ¿ªÀÇ °¡ÀåÀÚ¸®¿¡ À̸¥ °æ¿ìÀÌ´Ù. ÀÌ·¯ÇÑ °æ¿ì, ·Îº¿ÀÇ ¹«¼±·£ ¸ðµâÀº ÇöÀç AP¿ÍÀÇ Á¢¼Ó½ÅÈ£°¡ ³Ê¹« ¾àÇÏ´Ù°í ÆÇ´ÜÇÏ¿© ´Ù¸¥ AP¸¦ ã±â À§ÇØ ÇöÀç ÁøÇà ÁßÀÎ Åë½ÅÀ» Áß´ÜÇÏ°í ´Ù¸¥ AP¸¦ ã´Â ÀÛ¾÷À» ¼öÇàÇÏ°Ô µÇ´Âµ¥ À̸¦ AP °Ë»öÀ̶ó°í ÇÑ´Ù. AP °Ë»öÀÌ ³¡³ª°í »ó´ëÀûÀ¸·Î ¿ì¼öÇÑ ½Åȣũ±â¸¦ °®´Â »õ·Î¿î AP°¡ ¼±ÅÃµÇ¸é ±× AP·ÎÀÇ Á¢¼ÓÀ» ½ÃµµÇÏ°í, ¼º°øÀûÀ¸·Î Á¢¼ÓÀÌ ÀÌ·ç¾îÁö¸é ±× ½Ã°£ ÀÌÈķδ »õ·Î¿î AP¸¦ ÅëÇؼ­ µ¥ÀÌÅ͸¦ Àü¼ÛÇÏ°Ô µÈ´Ù. ÀÌ·¯ÇÑ AP ±³Ã¼°úÁ¤À» ÇÚµå¿À¹ö¶ó Á¤ÀÇÇÑ´Ù. ·Îº¿¿¡ žÀçµÈ IEEE 802.11 ¹«¼±·£ ¸ðµâÀº ·Îº¿ÀÇ À̵¿¼º ¶§¹®¿¡ ºó¹øÇÑ ÇÚµå¿À¹ö°¡ ¹ß»ýÇÏ°Ô µÇ°í, ÀÌ·Î ÀÎÇØ ¹ß»ýµÇ´Â Á¢¼ÓÀÇ ´ÜÀýÀº Àü¹ÝÀûÀÎ Åë½Å ¼º´É¿¡ Å« ¿µÇâÀ» ¹ÌÄ¡°Ô µÈ´Ù. º» Ç¥ÁØÀÇ Æò°¡ Ç׸ñÀº ·Îº¿¿¡ žÀçµÈ ¹«¼±·£(IEEE 802.11a/b/g) Á¦Ç°ÀÇ AP¿Í AP °£ÀÇ ÇÚµå¿À¹öÀÇ ¾ÈÁ¤¼º°ú ½Å¼Ó¼ºÀ» ÃøÁ¤ÇÏ´Â °ÍÀÌ ¸ñÀûÀÌ´Ù.
¿µ¹®³»¿ë¿ä¾à In wide area where several APs are located, an acceptable level of communication quality of IEEE 802.11 WLAN is not guaranteed due to robot mobility. For example, as the robot moves away from the location of the AP currently in service, it may reach the point where the service is barely available. In this case, the IEEE 802.11 WLAN module in the robot usually start searching for new APs to connect. Such a procedure is called AP scanning. Once the AP scanning is done, the robot selects the AP with relatively stronger signal and attempts to make connection to it. Once the connection attempt is successful, the robot starts to communicate with the new AP. Such a procedure of changing is called handover. The robots in wide-area IEEE 802.11 WLAN environment will experience several handover and such a frequent disruption in connection has a significant impact on communication performance. This standard is proposed to evaluate the level of disruption in communication and to measure the stability and performance of handover procedure of IEEE 802.11 WLAN based mobile robots.
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