| Âê̾ | ¥¹¥ޡ¼¥ȥ¢¥ó¥ƥʤΥӡ¼¥àÉý¤ÈÁ÷¿®ÅÅÎϤÎŬ±þŪ¤Ê¸æÊýˡ¤ˤĤ¤¤Æ |
| Ãø¼Ô | *ÀÄÌÚ ͦÂÀ (ÀŲ¬Âç³ؾðÊó³ظ¦µæ²Ê), ÌÚë ͧºÈ (ÀŲ¬Âç³ؼã¼ꥰ¥¥Х븦µæ¥¥¼°éµòÅÀ), èßÂå ²í´õ (¾åÃÒÂç³ØÍý¹©³ØÉô), ÅÏÊÕ ¾° (ÀŲ¬Âç³ؾðÊó³ظ¦µæ²Ê) |
| Page | pp. 244 - 254 |
| Keyword | ¥¢¥ɥۥ寥ͥåȥ¥¯, ¥¹¥ޡ¼¥ȥ¢¥ó¥ƥÊ, »ظþ¥ӡ¼¥à |
| Abstract | ¥¹¥ޡ¼¥ȥ¢¥ó¥ƥʤȤϡ¤¥ӡ¼¥à¤λظþ¤ò¸æ¤Ǥ¤륢¥ó¥ƥʤΤ³¤ȤǤ¢¤ꡤ¤³¤ì¤òÍøÍѤ¹¤뤳¤Ȥˤè¤ê°ìÄêÊý¸þ¤إӡ¼¥à¤ò¸þ¤±¡¤Ä̿®üËö´֤δ³¾ĤòËɤ°¤³¤ȤÇ̵ÀþÄ̿®¤ζõ´ÖÍøÍѸúΨ¤ò¸þ¾å¤Ǥ¤롥¥¹¥ޡ¼¥ȥ¢¥ó¥ƥʤÎÍøÅò³èÍѤ¹¤뤿¤á¤λظþ MAC ¥ץí¥ȥ³¥ë¤ÎÀ߷פǤϡ¤Á÷¼¢¥ó¥ƥʤλظþ (Á÷¼ӡ¼¥àÊý¸þ¡¦Éý¡ˡ¤Á÷¿®ÅÅÎϡ¤Á졼¥ȤθæÊýˡ¤¬¼ç¤ʲÝÂê¤Ȥʤ롥ËܹƤǤϡ¤¤ޤº¡¤»ظþ¸æ¤ËÃíÌܤ·¡¤ÂåɽŪ¤Ê MAC ¥ץí¥ȥ³¥ë¤Ǥ¢¤ë DMAC ¤ò¤Ȥê¾夲¡¤¥ӡ¼¥à·Á¤˴ؤ·¤ưÜư´Ķ¤ˤª¤±¤ë´ðÁÃɾ²롥¤³¤ì¤ˤè¤ꡤüËö¤ΰÜư¤ȥȥé¥ե£¥å¯¥ե¤ˤè¤äƺÇŬ¤ʥӡ¼¥àÉý¤¬ÊÑư¤¹¤뤳¤ȤòÌ餫¤ˤ¹¤롥¼¡¤ˡ¤¤³¤ηë²̤òÍѤ¤¤ơ¤Ä̿®üËö¤ΰÜư¤ȥȥé¥ե£¥å¯¥ե¤˱þ¤¸¤ơ¤Ä̿®üËö¤Υӡ¼¥àÉý¤òŬ±þŪ¤Ë¸椹¤ëÊý¼° ADMAC (Adaptive Directional MAC) ¤òÄó°Ƥ¹¤롥Äó°Ƽêˡ¤Ǥϡ¤Ä̿®üËö¤ΰÜư¤ȥȥé¥ե£¥å¯¥ե¤«¤顤Ŭ±þŪ¤˥ӡ¼¥àÉý¤ò·»¤·¡¤ưŪ¤ËÊѲ½¤¹¤ë´Ķ¤ˤª¤¤¤Ƥâ¹⤤¥¹¥롼¥ץåȤò¼¸½¤¹¤롥ǽɾ²ˤè¤ꡤDMAC ¤ˤª¤±¤ë¥ӡ¼¥àÉý60¡ë¤ÈÈæ³Ӥ·¤ơ¤üËö¤¬ÀŻ߾õÂ֤ΤȤ¤ˤϺÇÂç 1.4 ÇܤΥ¹¥롼¥ץåȡ¤üËö°Üư®Å٤¬ 40 km/h ¤ΤȤ¤ˤϡ¤ºÇÂç 1.2 ÇܤΥ¹¥롼¥ץåȤò¼¸½¤Ǥ¤뤳¤Ȥ¹¡¥¤µ¤é¤ˡ¤ADMAC¤ËÁ÷¿®ÅÅÎϸæ¤ò²Ạ̃¤·¤¿Êý¼°¤â¹ͰƤ¹¤롥 |
| Âê̾ | Experimental Discussions on Wireless Networks using Smart Antennas |
| Ãø¼Ô | *Jiefu Yu, Takashi Watanabe (Shizuoka University) |
| Page | pp. 255 - 262 |
| Keyword | network, wireless, smart antenna, MAC |
| Abstract | Typically wireless networks are assumed in omni-antennas, transmissions among neighboring nodes in wireless networks may interfere with each other. If a node unicast packets with a directional beam, the undesired interference to the neighborhood nodes lying outside its directional beam pattern can be largely reduced. Most studies evaluate the performance of transmission with smart antennas by simulations. In those evaluations the radiation pattern of antennas and wave propagation are ideally modeled. In this paper we evaluated the throughput performance of transmission in variety topologies using smart antennas with directional beamform and omni-directional beamform by experiments based on the UNAGI/ESPAR. We discuss the interference in these topologies with analysing the result of the experiment. As a result, we find that transmission of the smart antennas with narrow directional beamform to the same direction may have a higher throughput due to reduce the interference to the transmitter. |
| Âê̾ | ʣ¿ô¼þÇȿôÂӤòÍøÍѤ¹¤륢¥ɥۥ寥ͥåȥ¥¯¤ÎÄ̿®Êý¼°¤ˤĤ¤¤Æ |
| Ãø¼Ô | *¶ÌÃÖ ·òÂÀ, Raptino H. Ari (ÀŲ¬Âç³ؾðÊó³ظ¦µæ²Ê), ÌÚë ͧºÈ (ÀŲ¬Âç³ؼã¼ꥰ¥¥Х븦µæ¥¥¼°éµòÅÀ), èßÂå ²í´õ (¾åÃÒÂç³ØÍý¹©³ØÉô), ÅÏÊÕ ¾° (ÀŲ¬Âç³ؾðÊó³ظ¦µæ²Ê) |
| Page | pp. 263 - 270 |
| Keyword | ¥¢¥ɥۥ寥ͥåȥ¥¯, ¥ޥë¥ۥå×, ¼þÇȿô |
| Abstract | ¶áǯ¡¤̵Àþ¥¢¥ɥۥ寥ͥåȥ¥¯¤¬ÃíÌܤµ¤ì¤Ƥ¤¤롥¥¢¥ɥۥ寥ͥåȥ¥¯¤Ï ¼«Χʬ»¶·¿¤Υͥåȥ¥¯¤ǡ¤´û¸¤Υ¤¥ó¥ե饹¥ȥ饯¥ã¤Τʤ¤¾ì½ê¤Ç̵ÀþüËö¤¬ ̵Àþ¥ޥë¥ۥå×Ä̿®¤ò¹Ԥ¦¡¥¤³¤Î̵Àþ¥ޥë¥ۥå×Ä̿®¤ιâÁ졼¥Ȳ½¤θ¦µ椬 ¿¤¯¹Ԥï¤ì¤Ƥ¤¤롥¤·¤«¤·¡¤ñ°ì¤μþÇȿô¤˸ÂÄꤷ¤¿¹âÁ졼¥Ȳ½¤θ¦µ椬¿¤¯¡¤ ʣ¿ô¼þÇȿôÂӤˤĤ¤¤ƹÍθ¤·¤Ƥ¤¤ʤ¤¡¥¤½¤Τ¿¤ᡤËܹƤϡ¤ʣ¿ô¤μþÇȿôÂӤò¸úΨ²½ ¤¹¤ë̵ÀþÄ̿®Êý¼°¤òÄó°Ƥ¹¤롥¼þÇȿôÂӤˤè¤äơ¤ÆääÍøÍѾ¬°ۤʤ뤳¤ȤËÃå Ìܤ·¡¤¼þÇȿôÂӤÎÍøÍѾò¹Íθ¤·¤¿Ä̿®Êý¼°¤òÄó°Ƥ¹¤롥¤³¤ÎÄ̿®¥ץí¥ȥ³¥ë¤ϼþ ÇȿôÂӤò¸úΨÎɤ¯ÍøÍѤ¹¤뤿¤á¤ˡ¤Ãٱä»þ´֤亮»¨¾ò¹Íθ¤·¤¿Ä̿®Êý¼°¤Ǥ¢¤롥 ¤ޤº¡¤¼þÇȿôÂӤ´¤Ȥ˰¸Àè¤ޤǤÎÃٱä»þ´֤òµá¤ᡤÃٱä»þ´֤µ¤¤¼þÇȿôÂӤòͥÀè ¤·¤ÆÄ̿®¤¹¤롥Äó°ÆÊý¼°¤ò·»µ¡¥·¥ߥå¥졼¥¿¤ˤè¤êɾ²·¡¤IEEE 802.11a ñÆȤË Èæ¤٤ơ¤¥¹¥롼¥ץåȤ¬ºÇÂçÌó1.8 Çܡ¤IEEE 802.11b ñÆȤËÈæ¤٤ơ¤¥¹¥롼¥ץåÈ ¤¬ºÇÂçÌó2.6 Çܸþ¾夹¤뤳¤Ȥ·¤¿¡¥ |
| Âê̾ | ¥¢¥ɥۥ寥ͥåȥ¥¯¾å¤μþÊվðÊóÇÛÉۤˤª¤±¤ë¾ðÊó¼ˤè¤ë·ÐϩÊѹ¹¤ò¹Íθ¤·¤¿¥եé¥åǥ£¥ó¥°¸æ¤ˤĤ¤¤Æ |
| Ãø¼Ô | *ƣ°æ ½ӽ¼ (ÂçºåÂç³ØÂç³ر¡¾ðÊó²ʳظ¦µæ²Ê), ²ü£ ½¼ (¥ѥʥ½¥˥å¯), º´¡¹ÌÚ ͦÏÂ, ¸¶ δ¹À, Èø ¾ϼ£Ϻ (ÂçºåÂç³ØÂç³ر¡¾ðÊó²ʳظ¦µæ²Ê) |
| Page | pp. 271 - 278 |
| Keyword | ¥¢¥ɥۥ寥ͥåȥ¥¯, ¥եé¥åǥ£¥ó¥°¸æ, Time To Live (TTL) |
| Abstract | ¥¢¥ɥۥ寥ͥåȥ¥¯¤ˤª¤¤¤ƼþÊդ˾ðÊó¤òÇÛÉۤ¹¤뤿¤á¤Υ¢¥ץ¥ΰì¤Ĥˡ¤¥եé¥åǥ£¥òÍѤ¤¤ëÊýˡ¤¬¤¢¤롥ɮ¼Ԥé¤Ϥ³¤ì¤ޤǤˡ¤¾¯¿ô¤θÇÄêüËö¤¬¸ºߤ¹¤ë´Ķ¤òÁÛÄꤷ¡¤¼þÊվðÊó¤òɬÍפȤ¹¤ëüËö¤¬¸ºߤ·¤ʤ¤Êý¸þ¤ؤÎÇÛÉۤòÍÞ¤¹¤뤿¤á¤Îack-carry Êý¼°¤ˤè¤ë¥եé¥åǥ£¥ó¥°¸æ¼êˡ¤òÄó°Ƥ·¤¿¡¥¤·¤«¤·¤³¤μêˡ¤Ǥϡ¤¼Îǧ(ACK) ¤òÇÛÉ۸µ¤Ȥʤë¸ÇÄêüËö¤ËľÀÜÊֿ®¤¹¤뤳¤ȤÇÇÛÉÛÈϰϤò·èÄꤷ¤Ƥ¤¤뤿¤ᡤ½ÂÂھðÊó¤Ȥ¤¤ä¿¼å¤˷Ðϩ¤òÊѹ¹¤¹¤ë¾ðÊó¤ˤÏŬÍѤǤ¤ʤ¤¡¥¤½¤³¤ÇËܹƤǤϡ¤¼þÊվðÊó¤ò¼·¤¿°ÜưüËÐϩ¤òÊѹ¹¤¹¤ë¾òÁÛÄꤷ¤ơ¤¸úΨŪ¤˼þÊվðÊó¤òÇÛÉۤ¹¤ë¥եé¥åǥ£¥ó¥°¸æ¼êˡ¤òÄó°Ƥ¹¤롥Äó°Ƽêˡ¤Ǥϡ¤¾ðÊó¤ò¼·¤¿°ÜưüˤºǸå¤˾ðÊó¤ò·Ðͳ¤·¤¿¸ÇÄêüËö¤ËACK ¤òľÀÜÊֿ®¤·¡¤ACK ¤ò¼·¤¿¸ÇÄêüËեé¥åǥ£¥ó¥°ÈϰϤò³Èĥ¤·¤Ƥ¤¤¯¡¥¤³¤ì¤ˤè¤ꡤ¼þÊվðÊó¤μå¤˰ÜưüËÐϩ¤òÊѹ¹¤¹¤ë¾ì¹ç¤Ǥ⡤¸úΨŪ¤˾ðÊó¤òÇÛÉۤǤ¤롥Äó°Ƽêˡ¤Î ǽɾ²ߥå¥졼¥·¥ç¥ó¤ˤè¤ê¹Ԥ¤¡¤ͭ¸ú¤ò³Îǧ¤·¤¿¡¥ |