53 南太平洋海域調査研究報告 No.56(2015年3月) OCCASIONAL PAPERS No.56(March 2015) ཱྀỌⰋ㒊ᓥ࠾ࡅࡿሗ㏻ಙᇶ┙ࡢ ⌧≧ᚋࡢᩚഛྍ⬟ᛶ ༖ᒇṇே Current Status and Future Potential of Broadband Infrastructure Development on Kuchinoerabujima Island MASUYA Masato 㮵ඣᓥᏛᏛ⾡ሗᇶ┙ࢭࣥࢱ࣮ Computing and Communications Center, Kagoshima University せ᪨ ㉸㧗㏿ࣈ࣮ࣟࢻࣂࣥࢻࡢᩚഛࡀᅜⓗ㐍ࡴ୍᪉࡛ࠊᑠつᶍ࡞㞳ᓥࡸᒣ㛫㒊࡞ᆅ⌮ⓗ᮲௳ࡀ࡞ ᆅᇦ࡛ࡣᮍࡔࣈ࣮ࣟࢻࣂࣥࢻࡢᜠᜨࢆཷࡅࡿࡇࡀ࡛ࡁ࡞࠸ᆅᇦࡀከ࠸ࠋᒇஂᓥ⏫ࡢཱྀỌⰋ㒊ᓥࡶࡑࡢ ୍ࡘ࡛࠶ࡿࠋཱྀỌⰋ㒊ᓥ࠾ࡅࡿࣈ࣮ࣟࢻࣂࣥࢻࡢᚲせᛶཬࡧᑗ᮶ࡢά⏝ྍ⬟ᛶࡘ࠸࡚ࠊ⌧ᅾࡢሗ ㏻ಙᇶ┙ࡢ≧ἣࢆㄪࡿࡇ࡛᫂ࡽࡍࡿࡶࠊࣈ࣮ࣟࢻࣂࣥࢻᩚഛࢆ⾜࠺ሙྜࡢ」ᩘࡢ᪉ἲ ࡘ࠸࡚ẚ㍑᳨ウࡍࡿࠋ ࡣࡌࡵ ࣈ࣮ࣟࢻࣂࣥࢻሗ㏻ಙᇶ┙ࡢᩚഛ⋡ࡣᅜⓗࡣ 100%ࡉࢀ࡚࠸ࡿࠋࡇࢁࡀࠊཱྀỌ Ⰻ㒊ᓥࡣᩚഛࡉࢀ࡚࠸࡞࠸ࠋᮏ◊✲࡛ࡣࠊཱྀỌⰋ㒊ᓥᚋࡶࣈ࣮ࣟࢻࣂࣥࢻࡀᩚഛࡉࢀ ࡞ࡅࢀࡤ࠺࡞ࡿࡢࡘ࠸࡚ࠊ⌧ᅾࡢሗ㏻ಙᇶ┙࡛ఱࡀ࡛ࡁࡿࢆㄪࠊᩚഛᆅᇦࡢ ẚ㍑ࡼࡾᒎᮃࡍࡿࠋࡲࡓࠊཱྀỌⰋ㒊ᓥࣈ࣮ࣟࢻࣂࣥࢻࢆᩚഛࡍࡿ」ᩘࡢ᪉ἲࡘ࠸࡚ࠊ ᐇドࢆྵࡵ࡚ẚ㍑᳨ウࡍࡿࠋ 54 MASUYA Masato ཱྀỌⰋ㒊ᓥࡢሗ㏻ಙᇶ┙ࡢ⌧≧ ୍⯡ୡᖏ࠾࠸࡚ሗ㏻ಙᇶ┙ࡋ࡚⏝࡛ࡁࡿࡢࡣࠊ᭷⥺ᘧࡢຍධ㟁ヰࢧ࣮ࣅࢫᦠᖏ 㟁ヰࢧ࣮ࣅࢫ࡛࠶ࡿࠋ ຍධ㟁ヰࢧ࣮ࣅࢫ ᭷⥺ᘧࡢຍධ㟁ヰࢧ࣮ࣅࢫࡣࠊᅜẸ⏕άྍḞ࡛࠶ࡿࡓࡵ㐢ࡃ᪥ᮏᅜ࠾࠸࡚ᥦ౪ࡉ ࢀࡿࡇࡀ㟁Ẽ㏻ಙᴗἲ࡛ᐃࡵࡽࢀ࡚࠾ࡾࠊཱྀỌⰋ㒊ᓥ࡛ࡶୡᖏ࡛⏝ྍ⬟࡛࠶ࡿࠋ ከࡃࡢᆅᇦ࡛ຍධ㟁ヰࢧ࣮ࣅࢫࡢ㓄⥺ࢆ⏝ࡋࡓADSLࢧ࣮ࣅࢫࡀᥦ౪ࡉࢀ࡚࠸ࡿࡀཱྀỌⰋ 㒊ᓥ࡛ࡣᥦ౪ࡉࢀ࡚࠸࡞࠸ࠋࡇࢀࡣࠊཱྀỌⰋ㒊ᓥࡢᒁࡀᓥእఏ㏦ᐜ㔞ࡢᑠࡉ࠸↓⥺ ᅇ⥺࡛ࡋ᥋⥆ࡉࢀ࡚࠾ࡽࡎࠊ㡢ኌ㏻ヰࢧ࣮ࣅࢫࡢᥦ౪ᨭ㞀ࡣ࡞࠸ࡶࡢࡢࠊ㧗㏿ࢹ࣮ࢱ ㏻ಙࢧ࣮ࣅࢫࡢᥦ౪ࡀ࡛ࡁ࡞࠸ࡓࡵ࡛࠶ࡿࠋ ᦠᖏ㟁ヰࢧ࣮ࣅࢫ ᦠᖏ㟁ヰࢧ࣮ࣅࢫࡣࠊNTT ࢻࢥࣔࡢᇶᆅᒁࡀᓥࡢᮾࠊ␒ᒇࢣᓠࡢᒣ㡬㏆ᩚഛࡉࢀ࡚ ࠸ࡿࠊᮏᮧ㞟ⴠࡣ NTT ࢻࢥࣔࡢ୰⥅ࣥࢸࢼ㸦ࣞࣆ࣮ࢱᒁ㸧ࡀタ⨨ࡉࢀ࡚࠾ࡾ㸦ᅗ 1㸧 ࠊ ᓥෆࡢ༙ࡢୡᖏ࡛⏝࡛ࡁࡿࠋࡓࡔࡋࠊ␒ᒇࢣᓠࡢᇶᆅᒁ࡛ᥦ౪ࡉࢀ࡚࠸ࡿࢧ࣮ࣅࢫࡣ NTT ࢻࢥࣔࡢ 3G ࢧ࣮ࣅࢫ࡛࠶ࡿ FOMA 㝈ࡽࢀࡿࠋࡲࡓࠊୖὶᅇ⥺ࡢᖏᇦࡀ༑ศ࡛࡞࠸ ࡇࡀᐃࡉࢀࡿࡓࡵࠊ㒔ᕷ㒊ྠᵝࡢ㏻ಙᖏᇦࡀ☜ಖ࡛ࡁ࡞࠸ྍ⬟ᛶࡀ࠶ࡿࠋ ᅗ 1 ᮏᮧ㞟ⴠࡢ NTT ࢻࢥࣔࡢࣞࣆ࣮ࢱᒁ 55 Current Status and Future Potential of Broadband Infrastructure Development on Kuchinoerabujima Island ࡢᦠᖏ㟁ヰᴗ⪅ࡢᇶᆅᒁࡣ࡞ࡃࢧ࣮ࣅࢫࡣ⏝࡛ࡁ࡞࠸ࠋࡲࡓࠊNTT ࢻࢥࣔࡢࢧ࣮ࣅ ࢫ࡛ࡶ LTE㸦Xi㸧ࡢ⏝ࡣ࡛ࡁࡎࠊᚋࡢᩚഛࡢணᐃࡶ♧ࡉࢀ࡚࠸࡞࠸ࠋ ࡞࠾ࠊᦠᖏ㟁ヰᴗ⪅ࡣࢧ࣮ࣅࢫ࢚ࣜぢ࡞ࡋ࡚࠸࡞࠸ࡀࠊྥᆅ༊࠾࠸࡚ࡣᒇஂᓥ タ⨨ࡉࢀ࡚࠸ࡿᦠᖏ㟁ヰᴗ⪅ࡢᇶᆅᒁࡢ㏻ಙࡀྍ⬟࡛࠶ࡿࠋࢧ࣮ࣅࢫ࢚ࣜእ࡛࠶ࡿ ࡓࡵ༑ศ࡞ရ㉁ࡀ☜ಖࡉࢀ࡚࠸ࡿࡣ㝈ࡽ࡞࠸ࡀࠊNTT ࢻࢥࣔࠊauࠊࢯࣇࢺࣂࣥࢡࠊྛ♫ࡢ LTE ࢧ࣮ࣅࢫࡀ⏝ྍ⬟࡛࠶ࡿࠋ 㞟ⴠࡼࡗ࡚⎔ቃࡣ␗࡞ࡿࡶࡢࡢࠊཱྀỌⰋ㒊ᓥ࠾࠸࡚ሗ㏻ಙᇶ┙ࡋ࡚⏝࡛ࡁࡿࡢ ࡣᦠᖏ㟁ヰᅇ⥺ࡢࡳ࡛࠶ࡿࠋᅇ⥺ࡢᖏᇦࡢ ᐃ⏝ྍ⬟࡞ࢧ࣮ࣅࢫࡢ᳨ドࢆ⾜࠸ࠊ⌧≧ࡢ ሗ㏻ಙᇶ┙࡛ࡇࡲ࡛ࣈ࣮ࣟࢻࣂࣥࢻࢧ࣮ࣅࢫࡢ⏝ࡀ࡛ࡁࡿࡢࢆ᫂ࡽࡋࡓ࠸ࠋ ཱྀỌⰋ㒊ᓥ࠾ࡅࡿሗ㏻ಙᇶ┙ᩚഛ᪉ἲ ࣈ࣮ࣟࢻࣂࣥࢻࡢᩚഛࡣᢏ⾡ⓗࡣᅔ㞴ࡣ࡞ࡃࠊගࣇࣂࢆᩜタࡋ࡚ࢿࢵࢺ࣮࣡ࢡᶵჾ ࢆタ⨨ࡍࡿࡔࡅ࡛࠶ࡿࠋࡇࢁࡀ㞳ᓥࡢሙྜࠊᾏୖࢆ⤖ࡪගࣇࣂᩜタከ㢠ࡢ㈝⏝ࡀ ࡿࡇࡀࡁ࡞ၥ㢟࡞ࡿࠋᅜࡢ⿵ຓ㔠ࢆᚓ࡚⮬యࡀᩚഛࡋࡓࡣ」ᩘ࠶ࡿࡀࠊཱྀỌ Ⰻ㒊ᓥࡣࡑࢀࡽࡢẚ࡚ᑐ㇟࡞ࡿୡᖏᩘࡀᴟࡵ࡚ᑠࡉࡃࠊᾏᗏࢣ࣮ࣈࣝࡢᩜタࡣ ᐇ⌧ࡀ㞴ࡋ࠸ࠋ ⾨ᫍࣥࢱ࣮ࢿࢵࢺ࣭ᦠᖏ㟁ヰᅇ⥺ ᾏᗏࢣ࣮ࣈࣝࡢᩜタ௨እࡣࠊ↓⥺ᢏ⾡ࢆ⏝࠸ࡿ᪉ἲࡀ࠶ࡿࠋ ேᕤ⾨ᫍࢆ⏝࠸ࡿ᪉ἲࡣࠊࡍ࡛ᓥෆࡢ㔠ᓅᑠ࣭୰Ꮫᰯ࠾࠸࡚ IPSTAR ♫ࡢ⾨ᫍࣥࢱ ࣮ࢿࢵࢺࢧ࣮ࣅࢫࢆ⏝ࡍࡿࡇ࡛ᐇ⌧ࡉࢀ࡚࠸ࡿࠋࡋࡋࠊ⾨ᫍࣥࢱ࣮ࢿࢵࢺࢧ࣮ࣅࢫ ࡣ㧗㢠࡛ࠊ㐜ᘏࡀࡁࡃࠊ㏿ᗘࡀ㐜ࡃࠊ」ᩘࡢᶵჾ࡛ᅇ⥺ࢆඹ᭷ࡍࡿࡣྥ࡞࠸ࠋ ᦠᖏ㟁ヰᅇ⥺ࡣ⾨ᫍࣥࢱ࣮ࢿࢵࢺྠࡌḞⅬࢆᣢࡘࠊࢹ࣮ࢱఏ㏦㔞ไ㝈ࡀ࠶ࡿࠋ ↓⥺ࢡࢭࢫ⨨ ↓⥺ࢡࢭࢫ⨨ࢆ࠺᪉ἲࡣࠊ⾨ᫍࣥࢱ࣮ࢿࢵࢺࡸᦠᖏ㟁ヰᅇ⥺ࡢࡼ࠺࡞ḞⅬࢆᣢࡓ ࡞࠸ࠋࡇࡢ᪉ἲࡣࠊ↓⥺ᒁචチࡀᚲせ࡞ࡶࡢࠊ↓⥺ᒁචチࡀせ࡞ࡶࡢࡀ࠶ࡿࠋ ↓⥺ᒁචチࡀᚲせ࡞ࡶࡢࡣࠊᑓ⏝ࡢ࿘Ἴᩘࢆ⏝ࡍࡿࡓࡵࡢ㏻ಙࡢᙳ㡪ࡀ࡞ࡃᏳᐃࡋ࡚ ㏻ಙ࡛ࡁࡿࠊ↓⥺ᒁචチࡀせ࡞ࡶࡢẚ࡚㧗࠸ฟຊ࡛㏦ಙࡀ࡛ࡁࠊ㛗㊥㞳࡛ࡶᏳᐃ ࡋࡓ㏻ಙࡀྍ⬟࡞ࡿࠋ୍᪉࡛ࠊᶵჾࡀẚ㍑ⓗ㧗౯࡛࠶ࡿࠋ ↓⥺ᒁචチࡀせ࡞ࡶࡢࡋ࡚ࡣࠊ2.4GHz ᖏࢆ⏝࠸ࡿ↓⥺ LAN ᶵჾࡀ࠶ࡿࠋචチࡀᚲせ ࡞ᶵჾẚ࡚㈝⏝ࢆᢚ࠼ࡿࡇࡀ࡛ࡁࠊタ⨨࠶ࡓࡗ࡚චチ⏦ㄳࡢᡭ⥆ࡁࡀせ࡛࠶ࡿࠋ ࡢᶵჾࡶ⏝ࡍࡿ࿘Ἴᩘ࡛࠶ࡿࡓࡵࠊᖸ΅ࡼࡿᙳ㡪ࢆ㝖እ࡛ࡁ࡞࠸ࡀࠊタ⨨᮲௳ࢆᕤኵ ࡍࡿ࡞ࡍࡿࡇࡼࡾࠊ࠶ࡿ⛬ᗘࡢᅇ㑊ࡀྍ⬟࡛࠶ࡿࠋᾏୖ㛗㊥㞳㏻ಙ࡛ࡣ 47.5km ࡲ࡛ ࡢᐇ⦼ࡀ࠶ࡿ㸦༖ᒇࡽ 2012㸧 ࠋ 56 MASUYA Masato ᭱ࡶ㏆࠸ࣈ࣮ࣟࢻࣂࣥࢻ᥋⥆ ↓⥺⨨ࡼࡾࣈ࣮ࣟࢻࣂࣥࢻࢧ࣮ࣅࢫᥦ౪ᆅᇦ᥋⥆ࡍࡿࡇ࡛ࠊཱྀỌⰋ㒊ᓥࡢࣈ࣮ࣟ ࢻࣂࣥࢻࡀྍ⬟࡞ࡿࠋཱྀỌⰋ㒊ᓥࡽ᭱ࡶ㏆࠸ࣈ࣮ࣟࢻࣂࣥࢻࢧ࣮ࣅࢫᥦ౪ᆅᇦࡣࠊ ࠾ࡼࡑ 15km 㞳ࢀࡓᒇஂᓥࡢỌ⏣ᆅ༊࡛࠶ࡿࠋḟ㏆࠸ࡢࡣ࠾ࡼࡑ 35km 㞳ࢀࡓ୕ᓥᮧ◲㯤 ᓥ࡞ࡿࠋ ↓⥺ᶵჾࡢタ⨨ࡣࠊぢ㏻ࡋࡀ☜ಖ࡛ࡁࡿ⨨࡛࠶ࡿࡇࠊ㟁※ࡀ☜ಖ࡛ࡁࡿࡇࠊᅇ⥺ ࡀ☜ಖ࡛ࡁࡿࡇࠊࡢ 3 ࡘࡢ᮲௳ࡀᚲ㡲࡛࠶ࡿࠋཱྀỌⰋ㒊ᓥ࠾࠸࡚ࡇࢀࡽࡢ᮲௳ࢆ‶ࡓࡍ ࡢࡣࠊ␒ᒇࢣᓠᒣ㡬ࡋ࡞ࡃࠊᒇஂᓥỌ⏣ᆅ༊ࠊ୕ᓥᮧ◲㯤ᓥࠊᮏᮧ㞟ⴠࡑࢀࡒࢀ↓⥺ᶵ ჾ࡛᥋⥆ࡍࡿ᪉ἲࡀ᭱ၿ⪃࠼ࡽࢀࡿࠋࡇࢀࢆᐇドࡍࡿࡓࡵࠊᶵჾࢆᣢࡕ㎸ࢇ࡛ ᐃࢆ ⾜࠺ࡇࡋ࡚࠸ࡿࠋ ᘬ⏝ᩥ⊩ ༖ᒇṇே࣭㟷ᮌㅬ࣭ୗᅬᖾ୍ 2012㸬ᅜෆ᭱㛗ࡢᾏୖ㛗㊥㞳↓⥺ LAN ㏻ಙࢩࢫࢸ࣒࠾ ࡅࡿ㟁Ἴఏᦙ≉ᛶ㸬Ꮫሗࢩࢫࢸ࣒⎔ቃ◊✲㸪15㸸62-71㸬
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