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ÇѱÛÁ¦¸ñ(Korean Title) |
¾ÖµåȤ ³×Æ®¿öÅ© »ó¿¡¼ backoff ¾Ë°í¸®Áò ¼öÁ¤¿¡ ÀÇÇÑ ¼ºñ½º |
¿µ¹®Á¦¸ñ(English Title) |
Service Differentiation in Ad Hoc Networks by a Modified |
ÀúÀÚ(Author) |
°½Â¼®
±èÁø
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¿ø¹®¼ö·Ïó(Citation) |
VOL 31 NO. 04 PP. 0414 ~ 0428 (2004. 08) |
Çѱ۳»¿ë (Korean Abstract) |
¿©·¯ ÈÞ´ë¿ë À̵¿Åë½Å ÀåºñµéÀº Á¡Á¡ »ó¾÷ÀûÀ¸·Î ¼º°øÇÏ°í ÀÖÀ¸¸ç, À̵¿ÁßÀÇ »ç¿ëÀڵ鿡°Ô À¯¿ëÇÑ ¼ºñ½º¸¦ Á¦°øÇÑ´Ù. ÀÎÅͳÝÀÇ È®Àå¿¡ µû¶ó À̵¿Åë½ÅÀåºñµéÀº ÅؽºÆ®³ª ¸ÖƼ¹Ìµð¾î µ¥ÀÌŸµî°ú °°Àº ´Ù¾çÇÑ ÇüÅÂÀÇ µ¥ÀÌŸ¸¦ ¿ä±¸ÇÏ°Ô µÈ´Ù. ¿ä±¸ÇÏ´Â µ¥ÀÌŸÀÇ Çüųª »ç¿ëÀÚÀÇ µî±Þ¿¡ µû¶ó¼ µ¥ÀÌŸ ¼ºñ½º¿¡ ´ëÇÑ Ã³¸® ¶ÇÇÑ ´Þ¶óÁ®¾ß ÇÑ´Ù. ¹«¼±³×Æ®¿öÅ© »ó¿¡¼ ¼ºñ½º Â÷º°ÈÀÇ ±¸ÇöÀº ¸Å¿ì ¾î·Á¿îµ¥, ±× ÀÌÀ¯´Â ¹«¼±Àåºñ ÀÚüÀÇ À̵¿¼º°ú ¹«¼±Ã¤³ÎÀÇ Ãæµ¹ ¶§¹®ÀÌ´Ù. ¹«¼±Ã¼³ãÀÇ Ãæµ¹Àº Binary Exponential Backoff(BEB) ¾Ë°í¸®ÁòÀ» »ç¿ëÇÏ¿© ÇØ°áÇÒ ¼ö ÀÖ´Ù. ¿ì¸®´Â ±Ý, Àº, µ¿À¸·Î ¸í¸íµÈ ¼¼ °¡Áö Á¾·ùÀÇ µ¥ÀÌŸÀÇ È帧À» Áö¿øÇÒ ¼ö ÀÖ´Â backoff ¾Ë°í¸®ÁòÀÇ ¼öÁ¤¿¡ ´ëÇÏ¿© ³íÇÑ´Ù. ¿¹¸¦ µé¾î, ±Ý±Þ µ¥ÀÌŸ È帧Àº °¡Àå ³ôÀº ¿ì¼±¼øÀ§¸¦ °¡Áö°í ÀÖ¾î ¿ä±¸µÇ´Â ¸ñÇ¥´ë¿ªÀ» ¸¸Á·½ÃÄÑ¾ß ÇÏ°í, Àº±Þ µ¥ÀÌŸÈ帧Àº µ¿±Þ¿¡ ºñÇÏ¿© ÃæºÐÈ÷ ¸¹Àº ¾çÀÇ ´ë¿ªÆøÀ» Á¦°øÇϵµ·Ï ÇØ¾ß ÇÑ´Ù. Ad Hoc ³×Æ®¿öÅ©¿¡¼ »ç¿ëµÇ´Â µÎ°³ÀÇ Æ®·£½ºÆ÷Æ® ÇÁ·ÎÅäÄÝÀÎ UDP¿Í TCPÀÇ º´Çà »ç¿ëÀº backoff ¾Ë°í¸®ÁòÀÇ ¼öÁ¤À» ¸Å¿ì ¾î·Æ°Ô ÇÑ´Ù. UDP¿Í TCPÀÇ ¼·Î ´Ù¸¥ Ư¼º ¶§¹®¿¡ À̸¦ ÇØ°áÇϱâ À§ÇØ °¢°¢ÀÇ ÇÁ·ÎÅäÄÝ¿¡ ¼·Î ´Ù¸¥ ÇüÅÂÀÇ ¼öÁ¤µÈ backoff ¾Ë°í¸®ÁòÀ» Á¦¾ÈÇÑ´Ù. Á¦¾ÈÇÑ ¾Ë°í¸®ÁòÀÌ Æ®·£½ºÆ÷Æ® ÇÁ·ÎÅäÄÝÀÇ ÇüÅ¿¡ °ü°è¾øÀÌ ¼·Î ´Ù¸¥ ±ÞÀÇ µ¥ÀÌŸÈ帧 °£ÀÇ ¼ºñ½º¸¦ Â÷º°È½ÃÅ´À» ¸ðÀǽÇÇèÀ» ÅëÇÏ¿© º¸¿´´Ù. |
¿µ¹®³»¿ë (English Abstract) |
Many portable devices are coming to be commercially successful and provide useful services to mobile users. Mobile devices may request a variety of data types, including text and multimedia data, thanks to the rich content of the Internet. Different types of data and/or different classes of users may need to be treated with different qualities of service. The implementation of service differentiation in wireless networks is very difficult because of device mobility and wireless channel contention when the backoff algorithm is used to resolve contention. Modification of the binary exponential backoff algorithm is one possibility to allow the design of several classes of data traffic flows. We present a study of modifications to the backoff algorithm to support three classes of flows: gold, silver, and bronze. For example, the gold class flows are the highest priority and should satisfy their required target bandwidth, whereas the silver class flows should receive reasonably high bandwidth compared to the bronze class flows. The mixture of the two different transport protocols, UDP and TCP, in ad hoc networks raises significant challenges when defining backoff algorithm modifications. Due to the different characteristics of UDP and TCP, different backoff algorithm modifications are applied to each class of packets from the two transport protocols. Nevertheless, we show by means of simulation that our approach of backoff algorithm modification clearly differentiates service between different flows of classes regardless of the type of transport protocol. |
Å°¿öµå(Keyword) |
ÀÎÅÍ³Ý Á¢±Ù ³×Æ®¿öÅ©
backoff ¾Ë°í¸®Áò
Ad Hoc ³×Æ®¿öÅ©
backoff algorithm
Ad Hoc network
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