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¿µ¹®Ç¥Áظí Mobile VoIP Quality of Service Requirements
Çѱ۳»¿ë¿ä¾à º» Ç¥ÁØÀº ¸ð¹ÙÀÏ È¯°æÀÎ ÈÞ´ëÀÎÅÍ³Ý ¸ÁÀ» ÅëÇÏ¿© À½¼º¼­ºñ½º¸¦ Á¦°øÇÏ´Â °æ¿ì¿¡ À־ÀÇ ÀÎÅͳÝÀüÈ­ ÅëÈ­Ç°Áú ±âÁØÀ» Á¦½ÃÇÑ´Ù. ¸ÕÀú, ÅëÈ­Ç°ÁúÀÇ ÁÖ°üÀû Æò°¡ ¹æ¹ýÀÎ MOSÀÇ Æ¯Â¡ ¹× Á¾·ù¸¦ ¿ä¾àÇÏ°í, ÂüÁ¶ÇÏ°í ÀÖ´Â µÎ °¡Áö °´°üÀû Æò°¡ ¹æ¹ý¿¡ ´ëÇÏ¿© ¼³¸íÇÑ´Ù. Çϳª´Â ÇöÀç À¯¼± ÀÎÅͳÝÀüÈ­ÀÇ ÅëÈ­Ç°ÁúÀ» Æò°¡ÇÏ´Â ¹æ¹ýÀ¸·Î »ç¿ëµÇ°í ÀÖ´Â, Àü´Þ¸ÁÀÇ ³×Æ®¿öÅ© Ç°ÁúÁöÇ¥·ÎºÎÅÍ À½¼ºÇ°ÁúÀ» ÃßÁ¤ÇÏ´Â E-Model ¹æ¹ýÀÌ°í, ´Ù¸¥ Çϳª´Â À̵¿Åë½Å¿¡¼­ ÅëÈ­Ç°ÁúÀ» Æò°¡Çϴµ¥ »ç¿ëÇÏ°í ÀÖ´Â, ¼Û½ÅÇÑ ¿øÀ½°ú ¼ö½ÅµÈ À½¼ºÀ» ºñ±³ÇÏ¿© Æò°¡ÇÏ´Â PESQ ¹æ½ÄÀÌ´Ù. ´ÙÀ½À¸·Î ±¹³»¿Ü Ç¥ÁØ ±â±¸¿¡¼­ ÀÎÅͳÝÀüÈ­¿¡ ´ëÇÑ ÅëÈ­ Ç°ÁúÀ» ¾î¶»°Ô ºÐ·ùÇÏ°í ÀÖ´Â »ìÆ캸°í, ¸¶Áö¸·À¸·Î ¸ð¹ÙÀÏ È¯°æ¿¡ ÀûÇÕÇÑ ÀÎÅͳÝÀüÈ­ÀÇ ÅëÈ­Ç°Áú ÁöÇ¥¸¦ Á¦½ÃÇÑ´Ù. ÀÌ ÁöÇ¥¿¡´Â PESQ±â¹ÝÀÇ MOS°ª, ´Ü´ë´ÜÁö¿¬(end-to-end delay), È£¼º°ø·üÀ» Æ÷ÇÔÇÑ´Ù. PESQ À½¼ºÇ°Áú ±âÁØ °ª¿¡´Â E-Model ¹æ½Ä¿¡¼­ »ç¿ëÇÏ´Â »ç¿ëÀÚ ÆíÀǼº(¹«¼±, À̵¿¼º)¿¡ µû¸¥ °¡»êÁ¡(Advantage)ÀÎ A°ª¿¡ ÇØ´çÇÏ´Â °ªÀ» ¹Ý¿µÇÏ¿´°í, ´Ü´ë´ÜÁö¿¬ °ªÀº À̵¿Åë½Å ¼öÁØÀ¸·Î Á¤ÀÇÇÑ´Ù.
¿µ¹®³»¿ë¿ä¾à This standard provides indexes and values to evaluate voice quality of mobile Internet telephony over WiBro network. First, the document summarizes existing methods of voice quality measurement including MOS as a subjective method, and E-Model and PESQ as objective methods. Then, it introduces how to evaluate or grade voice quality defined in the existing domestic and international standards. Finally, it provides voice quality criteria of Internet telephony appropriate to mobile environment. These criteria employ PESQ (MOS-LQO), end-to-end delay, and call success rate.
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