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Á¦¸ñ LTE QoS (2Æí) - LTE QoS ÆĶó¹ÌÅÍ (QCI, ARP, GBR, MBR µî)
ÀÛ¼ºÀÏÀÚ 2014-08-20

¾îÁ¦¿¡ À̾î LTE QoS¿¡ ´ëÇؼ­ ¼³¸íµå¸®¸ç, ¿À´ÃÀº LTE¿¡¼­ »ç¿ëµÇ´Â QoS ÆĶó¹ÌÅÍÀÇ Àǹ̸¦ »ìÆì º¸µµ·Ï ÇÏ°Ú½À´Ï´Ù.






EPS Bearer´Â Default EPS Bearer¿Í Dedicated EPS Bearer·Î ³ª´µ¾îÁö¸ç, ÀÌ EPS Bearer´Â ´ÙÀ½°ú °°Àº LTE QoS ÆĶó¹ÌÅ͸¦ °¡Áö°í LTE ¸Á¿¡¼­ QoS Á¦¾î¸¦ ¹Þ½À´Ï´Ù.

  • Resource Type: GBR or Non-GBR
  • QCI
  • ARP
  • GBR
  • MBR
  • APN-AMBR
  • UE-AMBR



ÀÌÁ¦ °¢ ÆĶó¹ÌÅÍ¿¡ ´ëÇؼ­ »ìÆì º¸µµ·Ï ÇÏ°Ú½À´Ï´Ù.



Resource Type = GBR (Guaranteed Bit Rate)

´ë¿ªÆøÀ» º¸Àå¹ÞÀ» ¼ö Àִ ŸÀÔÀÇ EPS Bearer¸¦ ³ªÅ¸³À´Ï´Ù. ÀÚ¿¬½º·´°Ô "º¸Àå¹ÞÀ» ´ë¿ªÆø" ÆĶó¹ÌÅÍ(GBR, µÚ¿¡¼­ ¼³¸í)°¡ QoS ÆĶó¹ÌÅÍ¿¡ ÇÔ²² Æ÷ÇԵ˴ϴÙ. Dedicated EPS Bearer¸¸ÀÌ GBR ŸÀÔÀÌ µÉ ¼ö ÀÖ°í, Default EPS Bearer´Â GBR ŸÀÔÀÌ µÉ ¼ö ¾ø½À´Ï´Ù.



Resource Type = Non-GBR

´ë¿ªÆøÀ» º¸Àå¹ÞÁö ¸øÇÏ´Â Best EffortÇü ŸÀÔÀÇ EPS Bearer¸¦ ³ªÅ¸³À´Ï´Ù. Default EPS Bearer´Â ÀÌ Non-GBR ŸÀÔ¸¸ µÉ ¼ö ÀÖ°í, Dedicated EPS Bearer´Â GBR ŸÀÔÀÏ ¼öµµ ÀÖ°í Non-GBR ŸÀÔÀÏ ¼öµµ ÀÖ½À´Ï´Ù.



QCI (QoS Class Identifier)

QCI´Â QoS ¿ì¼± ¼øÀ§¸¦ Á¤¼ö°ªÀÎ 1~9·Î Ç¥ÇöÇÑ °ÍÀ¸·Î Ç¥ÁØ¿¡ ±Ù°ÅÇÏ¿© °¢ °ª¸¶´Ù Resource Type (GBR or Non-GBR), Priority (1~9), Packet Delay Budget (ÆÐŶ Áö¿¬ Çã¿ëÄ¡°¡ 50ms ~ 300ms·Î Ç¥Çö), Packet Error Loss Rate (ÆÐŶ ¼Õ½Ç Çã¿ëÄ¡¸¦ 10¿¡ -2¿¡¼­ 10¿¡ -6À¸·Î Ç¥Çö)ÀÇ Æ¯¼º(°ª)À» ³»Æ÷ÇÏ°í ÀÖ½À´Ï´Ù. ÀÚ¼¼ÇÑ °ªÀº ±¸±Û¿¡¼­ "3GPP TS 23.203"À̶ó°í °Ë»öÇϼż­ ÇØ´ç ¹®¼­ Ç¥ 6.1.7¸¦ ÂüÁ¶Çϼ¼¿ä.

ºÐ¸í ÀÌ QCI °ª¿¡ µû¶ó EPS Bearer ȤÀº SDF°¡ º¸Àå¹ÞÀ» ¼ö ÀÖ´Â QoS Ç°ÁúÀÌ ´Þ¶óÁö´Â °ÍÀä. LTE Àåºñ¿¡¼­ ÀÌ QCI °ª ±â¹ÝÀ¸·Î ¾î¶»°Ô QoS¸¦ Â÷µîÈ­ÇÏ´ÂÁö, ±× ±¸Çö¿¡ ´ëÇؼ­´Â Àúµµ Àß ¸ð¸£°Ú³×¿ä(°³¹ßÀÚ°¡ ¾Æ´Ï¶ó¼­... ÂÁ). ´Ù¸¸ È®½ÇÇÑ °ÍÀº ¾Æ·¡ 3GPP Ç¥ÁØ ³»¿ë°ú °°ÀÌ QCI=1ÀÌ °¡Àå ÁÁ°í QCI=9°¡ °¡Àå ¾ÈÁÁ½À´Ï´Ù. ^^*



QCI=1

: Resource Type=GBR, Priority=2, Packet Delay Budget=100ms, Packet Error Loss Rate=10¿¡ -2, Example Service=Voice

QCI=9

: Resource Type=Non-GBR, Priority=9, Packet Delay Budget=300ms, Packet Error Loss Rate=10¿¡ -6, Example Service=Internet



Á¦ »ý°¢¿¡(¸ÂÀ»Áö´Â ¸ð¸£°Ú¾î¿ä) º» QCI °ªÀº ÁÖ·Î eNB°¡ ¹«¼±±¸°£¿¡¼­ ÆÐŶ Àü¼Û ¿ì¼±¼øÀ§¸¦ Á¦¾îÇϴµ¥ »ç¿ëÇÏ´Â µí ÇÕ´Ï´Ù. ¿Ö³Ä¸é À¯¼±±¸°£ ÀåºñÀÎ S-GW, P-GW°¡ ÆÐŶÀ» ó¸®Çϸ鼭 ÀÌ¿Í °°Àº QCIº° Ư¼ºÀ» °í·ÁÇÏ¿© Packet ForwardingÀ» ÇÑ´Ù´Â°Ô ½±Áö ¾Ê°Åµç¿ä(½Ã½ºÄÚ/ÁÖ´ÏÆÛ ¶ó¿ìÅÍ°¡ ÆÐŶº° QoS¸¦ ó¸®ÇÒ ¶§ Delay³ª Error Loss Rate¸¦ °í·ÁÇÏÁö´Â ¾ÊÀݾƿä. ´Ü¼øÈ÷ ÆÐŶÀÇ ¿ì¼±¼øÀ§(802.1p/DSCP/MPLS EXP) ±â¹Ý¿¡ ½ºÄÉÁ층(WFQ, DWRR, SPQµî)À» ÅëÇØ ¾î¶² ÆÐŶÀ» ¸ÕÀú ³»º¸³¾Áö¸¸ Á¦¾îÇϴϱî¿ä).



ARP (Allocation and Retention Priority)

ARP(0~15 Áß¿¡ ÇϳªÀÇ ¿ì¼±¼øÀ§ °ªÀ» °¡Áü)´Â LTE ¸Á¿¡ ÀÚ¿øÀÌ ºÎÁ·ÇÑ »óȲ¿¡¼­, »õ·Î¿î EPS Bearer°¡ »ý¼ºµÇ¾î¾ß ÇÏ´Â °æ¿ì,

    • ±âÁ¸ EPS Bearer¸¦ »èÁ¦ÇÏ°í »õ·Î¿î EPS Bearer¸¦ »ý¼ºÇÒ °ÍÀ̳Ä, (High Priority ARP¸¦ °¡Áø EPS Bearer°¡ »ý¼ºµÇ±â À§ÇØ Low Priority ARP¸¦ °¡Áø EPS Bearer¸¦ »èÁ¦ÇÑ´Ù)
    • ¾Æ´Ï¸é ÀÌ »õ·Î¿î EPS Bearer »ý¼ºÀ» °ÅÀý ÇÒ °ÍÀ̳ĸ¦ ÆÇ´ÜÇÏ´Â ÆĶó¹ÌÅÍÀÔ´Ï´Ù.



µû¶ó¼­ ÀÌ ARP °ªÀº »õ·Î¿î EPS Bearer »ý¼º/°ÅÀý¿¡¸¸  °ü¿©ÇÏÁö, ÀÏ´Ü EPS Bearer°¡ »ý¼ºÀÌ µÇ°í ÆÐŶµéÀÌ Áö³ª´Ù´Ï´Â »óȲ¿¡¼­´Â Packet Forwarding ¿ì¼± ¼øÀ§¿¡´Â °ü¿©ÇÏÁö ¾Ê½À´Ï´Ù.

ÀÌ ARPÀÇ ¾²ÀÓ»õ¿¡ ¿¹·Î ¸¹ÀÌ ³ª¿À´Â °ÍÀÌ Emergency VoIP callÀÔ´Ï´Ù. Áï, 119 ±ä±Þ VoIP ÀüÈ­¸¦ À§ÇÑ EPS Bearer »ý¼ºÀ» À§Çؼ­´Â ±âÁ¸ÀÇ EPS Bearer¸¦ »èÁ¦ÇÒ ¼ö ÀÖ´Ù´Â °ÅÁÒ.



GBR(UL/DL)

Resource TypeÀÌ GBRÀÎ °æ¿ì »ç¿ëµÇ´Â ÆĶó¹ÌÅÍ·Î LTE¸Á¿¡¼­ º¸ÀåÇØ¾ß ÇÏ´Â ´ë¿ªÆø(bitrate)À» ¸í½ÃÇÏ´Â ÆĶó¹ÌÅÍÀÔ´Ï´Ù. Non-GBRÇüÀÎ °æ¿ì ´ë¿ªÆø º¸ÀåÀÌ ¾øÀ¸¹Ç·Î º» GBR ÆĶó¹ÌÅÍ°¡ Àû¿ëµÇÁö ¾Ê½À´Ï´Ù. (ULÀº »óÇâ Æ®·¡ÇÈ ´ë¿ªÆø, DL´Â ÇÏÇâ Æ®·¡ÇÈ ´ë¿ªÆø)



MBR(UL/DL)

Resource TypeÀÌ GBRÀÎ °æ¿ì »ç¿ëµÇ´Â ÆĶó¹ÌÅÍ·Î LTE¸Á¿¡¼­ Çã¿ëµÈ ÃÖ´ë ´ë¿ªÆøÀ» ¸í½ÃÇÏ´Â ÆĶó¹ÌÅÍÀÔ´Ï´Ù. ¸¸¾à ÀÌ MBR¿¡¼­ ¸í½ÃÇÑ ´ë¿ªÆø ÀÌ»óÀ¸·Î ÆÐŶÀÌ À¯ÀԵǸé Æó±âµË´Ï´Ù.



APN-AMBR(UL/DL)

¾Õ¼­ MBR ÆĶó¹ÌÅ͸¦ º¸½Ã¸é¼­ ¿Ö Resource TypeÀÌ Non-GBRÇüÀÎ °æ¿ì¿¡´Â "´ë¿ªÆø Á¦ÇÑ"ÀÌ ¾øÀ»±î?¶ó°í Àǹ®À» °¡Áø ºÐµéÀÌ ÀÖÀ» °ÍÀÔ´Ï´Ù. Non-GBRÇüÀÎ °æ¿ì, ¸ðµç Non-GBRÇü EPS Bearer¸¦ ÇÕÃļ­ "´ë¿ªÆø Á¦ÇÑ"ÀÌ Àû¿ëµË´Ï´Ù. ±×¸®°í À̸¦ Á¦¾îÇÏ´Â ÆĶó¹ÌÅÍ°¡ APN-AMBR(UL/DL)ÀÔ´Ï´Ù. À§ ±×¸²ÀÇ ¿¹¿¡¼­ º¸½Ã´Â ¹Ù¿Í °°ÀÌ 2°³ÀÇ Non-GBRÇü EPS Bearer°¡ Á¸ÀçÇÏ°í ÀÌ 2°³ÀÇ EPS Bearer¿¡°Ô Çã¿ëµÈ ÃÖ´ë ´ë¿ªÆøÀ» APN-AMBR(UL/DL)¿¡¼­ ¸í½ÃÇÕ´Ï´Ù.



UE-AMBR(UL/DL)

À§ ±×¸² »ó¿¡´Â APN-AMBR°ú UE-AMBRÀÌ ¸¶Ä¡ °°Àº °Íó·³ º¸À̴µ¥¿ä. ¾Æ·¡ ±×¸²À» ºÁ ÁÖ½ÃÁÒ...

ÇϳªÀÇ UE´Â ¿©·¯°³ÀÇ PDN¿¡ Á¢¼ÓÀÌ °¡´ÉÇÏ°í(¿¹¸¦ µé¾î, PDN1Àº ÀÎÅͳݿë, PDN2´Â IMS¸¦ ÀÌ¿ëÇÑ VoIP¿ë) °¢ PDN Á¢¼Ó¸¶´Ù UE´Â IP ÁÖ¼Ò¸¦ °¡Áö°Ô µË´Ï´Ù. ÀÌ °æ¿ì, UE-AMBR(UL/DL)Àº PDN¿¡ »ó°ü¾øÀÌ ÇØ´ç UE°¡ ¼Û¼ö½ÅÇÏ´Â ¸ðµç Non-GBRÇü EPS Bearer¿¡°Ô Çã¿ëµÈ ÃÖ´ë ´ë¿ªÆøÀ» ¸í½ÃÇÏ°Ô µÇ´Â °ÍÀÔ´Ï´Ù.






 
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