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Ȩ Ȩ > ¿¬±¸¹®Çå > ±¹³» ³í¹®Áö > Çѱ¹Åë½ÅÇÐȸ ³í¹®Áö (The Journal of Korea Information and Communications Society)

Çѱ¹Åë½ÅÇÐȸ ³í¹®Áö (The Journal of Korea Information and Communications Society)

Current Result Document : 9 / 40 ÀÌÀü°Ç ÀÌÀü°Ç   ´ÙÀ½°Ç ´ÙÀ½°Ç

ÇѱÛÁ¦¸ñ(Korean Title) NAT ±â¹Ý »ç¹°ÀÎÅÍ³Ý È¯°æ¿¡¼­ ½Ç½Ã°£ Åë½Å Áö¿øÀ» À§ÇÑ MQTT-CoAP È¥ÇÕ ±â¹ý
¿µ¹®Á¦¸ñ(English Title) Hybrid Transmission of MQTT and CoAP for Real-Time Communications in NAT-Based IoT Environments
ÀúÀÚ(Author) ±è±Ù¼ö   Á¤ÁßÈ­   °í¼®ÁÖ   Keun-Soo Kim   Joong-Hwa Jung   Seok-Joo Koh  
¿ø¹®¼ö·Ïó(Citation) VOL 46 NO. 11 PP. 1822 ~ 1833 (2021. 11)
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(Korean Abstract)
NAT(Network Address Translation) ±â¼úÀ» »ç¿ëÇÏ´Â °æ¿ì Àιٿîµå(inbound, NAT ¿ÜºÎ ¡æ NAT ³»ºÎ) Åë½Å Àü¿¡ ¾Æ¿ô¹Ù¿îµå(outbound, NAT ³»ºÎ ¡æ NAT ¿ÜºÎ) Åë½ÅÀÌ ¸ÕÀú ÀÌ·ç¾îÁ®¾ß ÇÑ´Ù. À̶§, ÀÏÁ¤ ½Ã°£ÀÌ Áö³ª¼­ NAT ¸ÅÇÎ Å×À̺íÀÇ ¼¼¼ÇÀÌ ¸¸·áµÇ¸é NAT ¿ÜºÎ ³ëµå´Â NAT ³»ºÎ ³ëµå¸¦ ¹ß°ßÇÒ ¼ö ¾ø¾î¼­ Åë½Å ºÒ°¡´É »óÅ¿¡ ºüÁö°Ô µÈ´Ù. À̸¦ ÇØ°áÇϱâ À§ÇØ LwM2M(Lightweight M2M) ¿¡¼­´Â ÃʱâÈ­ °úÁ¤¿¡¼­ NAT ³»ºÎ ³ëµå°¡ ¿ÜºÎ ³ëµå¿¡ ¸ÕÀú ¿äûÀ» ÇÏ°í ¿ÀÇÁ¶óÀÎ »óÅÂÀÏ ¶§ ¿¬°á¿äûµéÀ» ´ë±â¿­¿¡ ÀúÀåÇÑ µÚ ¿Â¶óÀÎ »óŰ¡ µÇ¸é ó¸®ÇÏ´Â ¹æ½ÄÀ» ÃëÇϰí ÀÖ´Ù. ÇÏÁö¸¸ ÀÌ·¯ÇÑ ¹æ½ÄÀ¸·Î´Â ½Ç½Ã°£ ¼­ºñ½º Á¦°øÀÌ ¾î·Á¿ì¸ç, NAT ¹ÙÀεù À¯Áö¸¦ À§ÇÑ ´©Àû ¿À¹öÇìµå°¡ Å©°Ô ¹ß»ýÇÑ´Ù. ÀÌ ³í¹®¿¡¼­´Â ÀÌ·¯ÇÑ ¹®Á¦¸¦ ÇØ°áÇϱâ À§Çؼ­ MQTT(Message Queuing Telemetry Transport)¿Í CoAP(Constrained Application Protocol)¸¦ È¥ÇÕÇÏ¿© »ç¿ëÇÏ´Â M-CoAP Åë½Å ±â¹ýÀ» Á¦¾ÈÇÑ´Ù. Å×½ºÆ®º£µå ½ÇÇèÀ» ÅëÇØ Á¦¾È ±â¹ýÀ» »ç¿ëÇÏ¿© ½Ç½Ã°£ Åë½ÅÀÌ °¡´ÉÇÔÀ» È®ÀÎÇÏ¿´°í, ±âÁ¸ÀÇ LwM2M Åë½Å ±â¹ý°úÀÇ ºñ±³ ºÐ¼®À» ÅëÇØ Àü¼Û È¿À²ÀÌ ¾à 17% °³¼±µÉ ¼ö ÀÖÀ½À» È®ÀÎÇÏ¿´´Ù.
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(English Abstract)
Communication using NAT(Network Address Translation) requires outbound communication (internal node ¡æ external node) before performing inbound communication (external node ¡æ internal node). After a certain period of time, if the session of the NAT mapping table expires, the external node may not discover the internal node. To address this problem, LwM2M(Lightweight M2M) ensures that an internal node first sends a request to an external node during the initialization process, and that the requests generated in the off-line status are automatically stored in a queue so as to process those requests when they get into the on-line status. However, this approach may not provide real-time communication effectively, and large cumulative overhead may be incurred so as to maintain many NAT bindings for real-time communication. In this paper, to solve this problem, we propose the M-CoAP scheme that combines the two well-known protocols: MQTT(Message Queuing Telemetry Transport) and CoAP(Constrained Application Protocol). From testbed experimentation, we confirmed that the proposed M-CoAP scheme can provide real-time communication. By performance comparison with the existing LwM2M scheme, we also see that the proposed can improve the transmission throughput by 17%.
Ű¿öµå(Keyword) Internet of Things   Network Address Translation   Real-time Communication   Lightweight M2M   Constrained Application Protocol   Message Queuing Telemetry Transport  
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