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¿µ¹®Ç¥Áظí Licklider Transmission Protocol - Motivation
Çѱ۳»¿ë¿ä¾à º» Ç¥ÁØÀº ±ä ¸Þ½ÃÁöÀÇ ¶ó¿îµå-Æ®¸³ ½Ã°£ (RTT: round-trip time)À̳ª ¿¬°á»óÀÇ ÀæÀº ºÒÅëÀÇ Æ¯Â¡À» °¡Áö´Â ¸µÅ© »ó¿¡¼­ ÀçÀü¼Û ±â¹Ý ½Å·Ú¼ºÀ» Á¦°øÇϱâ À§ÇØ ¼³°èµÈ ¸®Å¬¶óÀÌ´õ Àü¼Û ÇÁ·ÎÅäÄÝ (LTP: Licklider Transmission Protocol)ÀÇ °³¹ß µ¿±â, Ư¡, ±â´É ¹× ÀüüÀûÀÎ ¼³°è ³»¿ë¿¡ ´ëÇØ ±â¼úÇÑ´Ù.
DTNÀÇ ¹øµé (Bundle) ÇÁ·ÎÅäÄÝÀÌ »ç¿ëµÈ Ç༺°£ Åë½ÅÀ» À§ÇÑ ÀÎÅÍ³Ý È¯°æ¿¡¼­ ¸®Å¬¶óÀÌ´õ Àü¼Û ÇÁ·ÎÅäÄÝÀº ´ÜÀÏ-È© ¿ìÁÖ °ø°£¿¡¼­ÀÇ RF (¶óµð¿À ÁÖÆļö) ¸µÅ© »ó¿¡ Åë½Å ½Å·Ú¼º Áö¿ø ¼ö·Å °èÃþÀ¸·Î »ç¿ëµÈ´Ù. ¸®Å¬¶óÀÌ´õ Àü¼Û ÇÁ·ÎÅäÄÝÀº ¼±ÅÃÀû Çã°¡ ¼ö½Å º¸°í (selective-acknowledgment reception reports)¸¦ ¿äûÇÔÀ¸·Î½á µ¥ÀÌÅÍ Àü¼ÛÀÇ ÀÚµ¿ ¹Ýº¹ ¿äû (ARQ : Automatic Repeat reQuest)À» ¼öÇàÇÑ´Ù.
¿µ¹®³»¿ë¿ä¾à This standard describes the motivation for LTP, its features, functions, and overall design to provide retransmission-based reliability over links characterized by extremely long message round-trip times (RTTs) and/or frequent interruptions in connectivity. Since communication across interplanetary space is the most prominent example of this sort of environment, LTP is principally aimed at supporting "long-haul" reliable transmission in interplanetary space, but it has applications in other environments as well. LTP does Automatic Repeat reQuest (ARQ) of data transmissions by soliciting selective-acknowledgment reception reports.
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