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ÇѱÛÁ¦¸ñ(Korean Title) |
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¿µ¹®Á¦¸ñ(English Title) |
A Handoff Mechanism to Avoid Congestion in Wireless Cells |
ÀúÀÚ(Author) |
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¿ø¹®¼ö·Ïó(Citation) |
VOL 30 NO. 05 PP. 0595 ~ 0603 (2003. 10) |
Çѱ۳»¿ë (Korean Abstract) |
À̵¿³ëµå¿¡°Ô Áö¼ÓÀûÀÎ Åë½Å¼ºñ½º¸¦ Á¦°øÇϱâ À§Çؼ´Â ÇÚµå¿ÀÇÁ ½Ã ¹ß»ýÇÏ´Â ÆÐŶ¼Õ½ÇÀ» ÃÖ¼ÒÈÇÏ´Â °ÍÀÌ ¸Å¿ì Áß¿äÇÏ´Ù. ÇÚµå¿ÀÇÁ°¡ ¹ß»ýÇßÀ» ¶§ ÆÐŶ¼Õ½Ç°ú ÀÌ¿¡ µû¸¥ TCP ¼º´É ÀúÇϸ¦ ÀÏÀ¸Å³ ¼ö ÀÖ´Â ¿äÀÎÀÌ ¿©·¯ °¡Áö°¡ Àִµ¥ ±× Áß Çϳª°¡ À̵¿ÇØ °£ ³ëµå¿¡ ÀÇÇÑ ¹«¼± ¼¿¿¡¼ÀÇ È¥Àâ¹ß»ýÀÌ´Ù. ÀÌ¿Í °°Àº È¥ÀâÀº À̵¿ÇÏ´Â ³ëµå»Ó¸¸ ¾Æ´Ï¶ó À̵¿ÇØ °£ ¼¿¿¡¼ ±âÁ¸¿¡ Åë½ÅÇÏ°í ÀÖ´ø ´Ù¸¥ À̵¿³ëµåµéÀÇ Åë½Å ¼º´É¿¡µµ ¿µÇâÀ» ¹ÌÄ£´Ù. ÀÌ¿¡ º» ³í¹®¿¡¼´Â °èÃþÀû FA(Foreign Agent) Æ®¸® ±¸Á¶¸¦ ±â¹ÝÀ¸·Î ÇÏ´Â ¹«¼± ³×Æ®¿öÅ© µµ¸ÞÀΠȯ°æ¿¡¼ ³ëµåÀÇ À̵¿À¸·Î ÀÎÇÑ ¹«¼± ¼¿¿¡¼ÀÇ È¥À⠹߻ýÀ» ÇÇÇÏ´Â »õ·Î¿î ÇÚµå¿ÀÇÁ ¹æ¾ÈÀ» Á¦¾ÈÇÏ°í À̸¦ ¢¥ÆÐŶÀá±ÝÁ¦¾î¢¥¶ó ºÎ¸£±â·Î ÇÑ´Ù. ÆÐŶÀá±ÝÁ¦¾î¿¡¼´Â ³ëµå À̵¿¿¡ µû¶ó Æ®·¡ÇÈ ¹ö½ºÆ®°¡ »õ·Î¿î ¼¿·Î ÇѲ¨¹ø¿¡ ÁøÀÔÇÏ´Â °ÍÀ» ¸·±â À§ÇØ ¹«¼± ³×Æ®¿öÅ© µµ¸ÞÀο¡¼ ÆÐŶ Àü´Þ °æ·Î¿¡ ÇØ´çÇÏ´Â °èÃþÀû Æ®¸® ºê·£Ä¡ »óÀÇ FAµéÀÌ À̵¿ÇÑ ³ëµåÀÇ ÆÐŶµéÀ» ¹öÆÛ¸µ ÇÏ¸é¼ Á¡ÁøÀûÀ¸·Î »õ·Î¿î ¼¿·Î Àü´ÞÇÏ´Â ÆÐŶÀÇ ¼ö¸¦ ´Ã·Á °¡µµ·Ï ÇÑ´Ù. ½Ã¹Ä·¹ÀÌ¼Ç °á°ú, À̵¿³ëµå°¡ °¡¿ë´ë¿ªÆøÀÌ »óÀÌÇÑ ¼¿°£¿¡ À̵¿ÇØ ³ª°¥ ¶§ Á¦¾ÈÇÏ´Â ÆÐŶÀá±ÝÁ¦¾î°¡ ±âÁ¸ÀÇ Áö¿ªÀû µî·Ïº¸´Ù ÆÐŶ ¼Õ½ÇÀÌ ³·À½À» º¸ÀÏ »Ó ¾Æ´Ï¶ó ³ëµå°¡ À̵¿ÇÑ ¼¿¿¡¼ ÀÌ¹Ì Åë½ÅÇÏ°í ÀÖ´ø ´Ù¸¥ À̵¿³ëµåµéÀÇ TCP ó¸®À²µµ Çâ»ó½ÃÅ´À» º¼ ¼ö ÀÖ¾ú´Ù. |
¿µ¹®³»¿ë (English Abstract) |
To provide mobile nodes with continuous communication services, it is important to reduce the packet losses during handoffs. The handoffs of mobile nodes cause packet losses and decrease of TCP throughput on account of a variety of factors. One of those is the congestion in the new cell. Due to the congestion, not only the node moving into the cell but also the already existing nodes that were successfully communicating in the cell suffer the performance degradation. In this paper we propose a new handoff mechanism called ´packet freeze control´, which avoids the congestion caused by handoffs by regulating the influx of traffic burst into the new cell. Packet freeze control is applicable to a wireless network domain in which FAs(Foreign Agents) are connected hierarchically and constitute a logical tree. It gradually increases the number of packets transferred to the new cell by buffering packets in the FAs on the packet delivery path over the wireless network domain. The simulation results show that the proposed mechanism not only reduces the packet losses but also enhances the TCP throughput of other mobile nodes in the cell. |
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