狭域交通情報共有のための車車間通信における車両位置情報に基づく効率的な中継転送方式の提案

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(1)Vol.2015-ITS-60 No.4 2015/3/4. ᝟ሗฎ⌮Ꮫ఍◊✲ሗ࿌ IPSJ SIG Technical Report. ⊃ᇦ஺㏻᝟ሗඹ᭷ࡢࡓࡵࡢ㌴㌴㛫㏻ಙ࡟࠾ࡅࡿ ㌴୧఩⨨᝟ሗ࡟ᇶ ᇶ࡙ࡃຠ⋡ⓗ࡞୰⥅㌿㏦᪉ᘧࡢᥦ᱌ ྜྷᕝ₶† ‫ ‮‬⣲⳹† ᑠⰼ ㈆ኵ† ITS(㧗ᗘ஺㏻ࢩࢫࢸ࣒)࡛ࡣ㸪㌴㌴㛫㏻ಙ࡟ࡼࡾ㸪࠾஫࠸ࡢ఩⨨࣭㏿ᗘ᝟ሗ➼ࢆ㢖⦾࡟஺᥮ࡋ࡚⾪✺ࢆ㜵Ṇࡍࡿࢩࢫ ࢸ࣒ࡢ◊✲㛤Ⓨࡀ⾜ࢃࢀ࡚ࡁ࡚࠸ࡿࡀ㸪௒ᚋࡣ㸪Ᏻ඲㐠㌿ࡢࡳ࡞ࡽࡎ㸪࢚ࢥࢻࣛ࢖ࣈࡸ㐠㌿ࡢᛌ㐺ᛶ㺃฼౽ᛶྥୖࢆᅗ ࡿࢩࢫࢸ࣒ࡢᐇ⌧ࡶᙉࡃᮇᚅࡉࢀࡿ㸬ᮏ✏࡛ࡣ㸪ࢻࣛ࢖ࣂࡀ㐨㊰ࡸ஺㏻ࡢ≧ἣ࡟ᛂࡌ࡚㉮⾜࡛ࡁࡿࡼ࠺࡟㸪㌴㌴㛫㏻ ಙ࡟ࡼࡾ῰⁫ࡸ஦ᨾ➼ࡢᒁᆅⓗ࡞஺㏻᝟ሗࢆ࿘㎶㌴୧࡛ຠ⋡ⓗ࡟ඹ᭷ࡉࡏࡿࡇ࡜ࢆ┠ⓗ࡜ࡋ࡚㸪୰⥅㌴୧㑅ᢥ࡟࠾ࡅ ࡿᚑ᮶᪉ᘧࡢၥ㢟Ⅼ࡛࠶ࡗࡓ࡯ࡰྠ఩⨨࡟࠶ࡿ㌴୧㛫࡛ࡢ㏻ಙࡢ⾪✺ࢆ㜵Ṇࡍࡿࡓࡵ࡟㸪700MHz ᖏࢆ౑ࡗ࡚ඹ᭷ࡉ ࢀࡿ఩⨨᝟ሗ࠿ࡽ㡰ᗎ௜ࡅ࡟ࡼࡿ୰⥅㌿㏦᪉ᘧࢆᥦ᱌ࡍࡿ㸬ࢩ࣑࣮ࣗࣞࢩࣙࣥ࡟ࡼࡾᥦ᱌᪉ᘧ࡜᪤Ꮡ᪉ᘧࢆẚ㍑ࡋ㸪 35%ࡢᣑᩓ⋡ྥୖ㸪55%ࡢ㐜ᘏ᫬㛫ࡢపῶࢆᐇ⌧ࡋࡓ㸬. Relative-position-based collision-free relay selection for efficient local sharing of traffic information JUN YOSHIKAWA†. SUHUA TANG† SADAO OBANA†. In ITS (Intelligent Transport Systems), inter-vehicle communications (IVCs) are used to exchange position and speed information between vehicles to avoid collisions. Besides this support system for safe driving, new functions like eco-driving, and comfort and convenience of driving are also strongly expected. This paper aims at efficient, local diffusion of congestion and accident information so that drivers can learn road and traffic conditions before hand, and change their routes accordingly. IVCs take place over two bands: 700MHz for safe driving and 5.9GHz for comfort driving. With the 700MHz band, vehicles learn the same local map of vehicles. This information provides the relative position between vehicles, and is used for relay selection for the communications in the 5.9GHz band. More specifically, potential relay vehicles are sorted according to their distances from the sending node, and the farthest, available vehicle is selected as the relay. The proposed scheme is implemented via network simulator. Extensive evaluations confirm that the proposed scheme achieves both higher diffusion rate and lower latency, compared with state-of-the-art methods.. 1. ࡣࡌࡵ࡟ ITS(㧗ᗘ㐨㊰஺㏻ࢩࢫࢸ࣒)࡛ࡣ㸪㌴୧㛫㏻ಙ࡟ࡼࡾ㸪࠾ ஫࠸ࡢ఩⨨࣭㏿ᗘ᝟ሗ➼ࢆ㢖⦾࡟஺᥮ࡋ࡚⾪✺ࢆ㜵Ṇࡍࡿ ࢩࢫࢸ࣒ࡢ◊✲㛤Ⓨࡀ⾜ࢃࢀ࡚ࡁ࡚࠸ࡿ[1]ࡀ㸪௒ᚋࡣ㸪Ᏻ ඲㐠㌿ࡢࡳ࡞ࡽࡎ㸪࢚ࢥࢻࣛ࢖ࣈࡸ㐠㌿ࡢᛌ㐺ᛶ㺃฼౽ᛶྥ ୖࢆᅗࡿࢩࢫࢸ࣒ࡢᐇ⌧ࡶᙉࡃᮇᚅࡉࢀࡿ㸬 ᮏ✏࡛ࡣ㸪ࢻ ࣛ࢖ࣂࡀ㐨㊰ࡸ஺㏻ࡢ≧ἣ࡟ᛂࡌ࡚෇⁥࠿ࡘᛌ㐺࡟㉮⾜࡛ ࡁࡿࡼ࠺࡟㸪㌴㌴㛫㏻ಙ࡟ࡼࡾ῰⁫ࡸ஦ᨾ➼ࡢᒁᆅⓗ࡞஺ ㏻᝟ሗࢆ࿘㎶㌴୧࡛ຠ⋡ⓗ࡟ඹ᭷ࡉࡏࡿࡓࡵࡢ㌴୧࡟࠾ࡅ ࡿ୰⥅㌿㏦᪉ᘧࡢᥦ᱌ࡋ㸪ࢩ࣑࣮ࣗࣞࢩࣙࣥホ౯࡟ࡼࡾ᭷ ຠᛶࢆ☜ㄆࡍࡿ㸬. ᅗ 1 ஺㏻᝟ሗඹ᭷᪉ᘧࡢᴫせ ࣉ୰⥅ࢆ⾜࠺ࡇ࡜࡛㐲ࡃࡢ㌴୧࡟᝟ሗࢆఏ㐩ࡍࡿ㸬㌴㌴㛫㏻ಙࢆ฼⏝ࡋ࡚஺㏻᝟ሗࡢඹ᭷ࢆ┠ⓗ࡜ࡍࡿ◊. 2. ஺㏻᝟ሗඹ᭷ࡢᴫせ࡜ࡑࡢㄢ㢟. ✲ࡣᩘከࡃᏑᅾ[2-8]ࡍࡿࡀ㸪㌴㌴㛫㏻ಙ࡟࠾࠸࡚㌴୧ࡢᛴ. ⊃ᇦ஺㏻᝟ሗඹ᭷ࡢᴫせࢆᅗ 1 ࡟♧ࡍ㸬⊃ᇦ஺㏻᝟ሗඹ. ࡏࡿࡓࡵࡢ㏻ಙ࡛ࡣ㸪㏻ಙࡢᑐ㇟ࡣ≉ᐃࡢ㌴୧࡛ࡣ࡞ࡃ㸪. ᭷࡜ࡣ㸪㌴㌴㛫㏻ಙࡸ㊰㌴㛫㏻ಙࢆ⏝࠸࡚㌴୧ࡀ㉮⾜୰࡟. ᝟ሗࢆᣑᩓࡉࡏࡿ⠊ᅖෆ࡟Ꮡᅾࡍࡿ୙≉ᐃከᩘࡢ㌴୧࡬ఏ. ᤕᤊࡋࡓᵝࠎ࡞஺㏻ⓗ࡞஦㇟࡟㛵ࡍࡿ᝟ሗࢆඹ᭷ࡍࡿࡇ࡜. 㐩ࡍࡿᚲせࡀ࠶ࡿ㸬ࡉࡽ࡟ྛ㌴୧ࡀ㧗㏿࡟⛣ືࡋ࡚࠸ࡿࡇ. ࡛෇⁥࡛ᛌ㐺࡞㐠㌿ࢆᐇ⌧ࡍࡿ௙⤌ࡳ࡛࠶ࡿ㸬ඹ᭷ࡍࡿ᝟. ࡜ࢆ⪃࠼ࡿ࡜ࣔࣅࣜࢸ࢕࡟฼Ⅼࡢ࠶ࡿࣈ࣮ࣟࢻ࢟ࣕࢫࢺ࡟. ሗࡣ஦ᨾ࣭῰⁫᝟ሗࡸ⥭ᛴ㌴୧᝟ሗ㸪㊰㠃᝟ሗ㸪ᛴไື᝟. ࡼࡿ᝟ሗࡢᣑᩓࡀᮃࡲࡋ࠸࡜⪃࠼ࡽࢀࡿ㸬ࣈ࣮ࣟࢻ࢟ࣕࢫ. ሗ㸪ࢻࣛ࢖ࣂࣜࢡ࢚ࢫࢺ࡞࡝ࢆ᝿ᐃࡋ㸪᝟ሗࡢ✀㢮ࡸ఩⨨. ࢺ࡟ࡼࡿ᝟ሗࡢᣑᩓࢆᐇ⌧ࡍࡿୖ࡛ࡢၥ㢟Ⅼ࡜ࡋ࡚㐲᪉ࡲ. ࢹ࣮ࢱ࡞࡝ࡢᑠᐜ㔞ࢹ࣮ࢱࢆ୰ᚰ࡜ࡍࡿ㸬ࡲࡓ࣐ࣝࢳ࣍ࢵ. ࡛᝟ሗࢆఏ㐩ࡉࡏࡿୖ࡛࡝ࡢ㌴୧࡟୰⥅ࡉࡏࡿ࠿࡜࠸࠺ㄢ. ไືࡸᏳ඲㐠㌿ᨭ᥼ࡸ῰⁫᝟ሗ࡞࡝ࡢ㐠㌿ᛌ㐺ᛶࢆྥୖࡉ. ͊㟁Ẽ㏻ಙ኱Ꮫ ኱Ꮫ㝔᝟ሗ⌮ᕤᏛ◊✲⛉ The University of Electro-Communications - Graduate School of Informatics and Engineering. ⓒ 2015 Information Processing Society of Japan. 1.

(2) Vol.2015-ITS-60 No.4 2015/3/4. ᝟ሗฎ⌮Ꮫ఍◊✲ሗ࿌ IPSJ SIG Technical Report 㢟ࡀ࠶ࡿ㸬. 2). Distance-Based Broadcast ࡢၥ㢟Ⅼ. ୰⥅㌴୧ࡢ㑅ᢥ᪉ᘧ࡜ࡋ࡚㸪᪤࡟㏦ಙ⪅࡜ཷಙ⪅ࡢ㊥㞳. ࡯ࡰྠ఩⨨࡟Ꮡᅾࡍࡿ㌴୧ࡀ」ᩘ࠶ࡿሙྜ㸪ࡑࢀࡽࡢ㌴. ᝟ሗࢆ⏝࠸࡚ࡼࡾ㐲᪉ࡢ㌴୧ࢆ୰⥅㌴୧࡜ࡋ࡚㑅ᢥࡍࡿ᪉. ୧࡟ࡼࡿ୰⥅ࣃࢣࢵࢺࡀ⾪✺ࡋ࡚ࣃࢣࢵࢺ฿㐩⋡ࡀపୗࡍ. ᘧ[2-6]ࡀᥦ᱌ࡉࢀ࡚࠸ࡿࡀ㸪㒔ᕷ㒊࡛ࡢ㧗ᐦᗘ࡞㌴୧⎔ቃ. ࡿၥ㢟Ⅼࡀ࠶ࡿ㸬. ࡛」ᩘ㌴⥺Ꮡᅾࡍࡿሙྜ࡞࡝࡯ࡰྠ఩⨨࡟㌴୧ࡀ࠸ࡿሙྜ㸪 ࡑࢀࡒࢀࡀ୰⥅ࡍࡿࣃࢣࢵࢺࡀ⾪✺ࡋ㸪㓄ಙຠ⋡ࢆపୗࡉ ࡏࡿ࡜࠸࠺ၥ㢟ࡀ࠶ࡿ㸬ࡇࡢၥ㢟ࢆゎỴࡍࡿࡓࡵ࡟ᮏ✏࡛ ࡣ㊥㞳࡛ࡣ࡞ࡃ㡰␒௜ࡅ࡟ࡼࡿ୰⥅㌿㏦᪉ᘧࢆᥦ᱌ࡋ㸪ຠ ⋡ⓗ࡛ప㐜ᘏ࡛ࡢ⊃ᇦ஺㏻᝟ሗࡢᣑᩓࢆᐇ⌧ࡍࡿ㸬. 3. ඛ⾜◊✲࡜ၥ㢟Ⅼ 3.1 ᪤Ꮡࡢ୰⥅ࣀ࣮ࢻ㑅ᢥ᪉ᘧ ⛣ືయ࢔ࢻ࣍ࢵࢡࢿࢵࢺ࣮࣡ࢡ࡛ࡢ᪤Ꮡࡢ୰⥅ࣀ࣮ࢻ. 4. ఩⨨᝟ሗ࡟ᇶ࡙ࡃ㡰ᗎ௜ࡅ࡟ࡼࡿ୰⥅㌿㏦᪉ᘧ 4.1 ᥦ᱌᪉ᘧࡢᴫせ ๓❶ࡢၥ㢟ⅬࢆゎỴࡍࡿ᪉ᘧ࡜ࡋ࡚㸪Ᏻ඲㐠㌿ᨭ᥼ࢩࢫ ࢸ࣒࡛ࡢ 700MHz ᖏ࡟ࡼࡗ࡚஺᥮ࡉࢀࡿ࿘ᅖࡢ㌴୧ࡢ఩⨨㸪㏿ᗘ㸪⛣ື᪉ྥࡢ᝟ሗ࡟ᇶ࡙࠸ࡓ㡰ᗎ௜ࡅ࡟ࡼࡿ୰⥅㌿㏦ ᪉ᘧࢆᥦ᱌ࡍࡿ㸬ࡲࡓ㸪ᮏ✏࡛ᢅ࠺஺㏻᝟ሗࡣ㸪ITS ฼⏝ ࡀチྍࡉࢀ࡚࠸ࡿ 5.8GHz ᖏ࡟࡚㏻ಙࡍࡿࡶࡢ࡜ࡍࡿ㸬. (㌴୧)ࡢ㑅ᢥ᪉ᘧ࡟ࡘ࠸࡚௨ୗ࡟ࡲ࡜ࡵࡿ㸬 (a)Flooding ࣃࢣࢵࢺࢆཷࡅྲྀࡗࡓࣀ࣮ࢻࡣࡑࡢࣃࢣࢵࢺࡀ᪤࡟ཷ ࡅྲྀࡗࡓࣃࢣࢵࢺ࠿࡝࠺࠿࡟㛵ࢃࡽࡎ࿘ᅖࡢࣀ࣮ࢻ࡟୰⥅. 4.2 ᶵ⬟ヲ⣽ 4.2.1 ㌴୧┦஫ࡢ㌴୧఩⨨ᢕᥱ 700MHz ᖏࢆ฼⏝ࡋ࡚㸪100ms ẖ࡟࿘ᅖࡢ㌴୧࡜఩⨨㸪. ࢆ⾜࠺㸬. ㏿ᗘ㸪⛣ື᪉ྥࡢ᝟ሗ࠾ࡼࡧ㌴୧ ID ࢆ஺᥮ࡍࡿ㸬ࡑࢀࢆඖ. (b)Probabilistic Scheme[7]. ࡟ྛ㌴୧ࡣ࿘ᅖࡢ㌴୧ࡢ఩⨨ࢆ᱁⣡ࡍࡿ㸬㌴୧఩⨨ࢆ┦஫. ☜⋡ⓗ࡟୰⥅ࢆ⾜࠺࠿ࢆỴᐃࡍࡿ᪉ᘧ࡛࠶ࡿ㸬ࣈ࣮ࣟࢻ. ࡟ ஺ ᥮ ࡍ ࡿ ࣃ ࢣ ࢵ ࢺ ࡟ ࡣ 㸪ARIB ࡼ ࡾ ᐃ ࡵ ࡽ ࢀ ࡿ STD. ࢟ࣕࢫࢺ࡟ࡼࡿࣃࢣࢵࢺࢆ᭱ึ࡟ཷಙࡋࡓ࡜ࡁ࡟☜⋡ P ࡟. T109[9]࡟‽ᣐࡍࡿ௨ୗࡢ⾲ 1 ࡢ᝟ሗࡀྵࡲࢀࡿࡶࡢ࡜ࡍ. ࡼࡗ࡚୰⥅ࢆ⾜࠺࠿ࢆุᐃࡍࡿ㸬P=1 ࡢሙྜ㸪Flooding ࡜. ࡿ㸬. ྠᵝࡢ᣺ࡿ⯙࠸࡟࡞ࡿ㸬⾲ 1 ఩⨨᝟ሗࣃࢣࢵࢺࡢᵓ㐀. (c)Counter-Based Scheme[7] ୰⥅ࢆ⾜࠺ሙྜ࡟ࣛࣥࢲ࣒࡞ᚅࡕ᫬㛫ࢆタᐃࡋ㸪ࣃࢣࢵ. 㡯┠. ㄝ᫂. ࢺࡢ㏦ಙࢆ㛤ጞࡍࡿ๓࡟௚ࡢࣀ࣮ࢻ࠿ࡽྠࡌࣃࢣࢵࢺࢆ n. NodeId. ㌴୧␒ྕ. ᅇཷಙࡍࡿࡇ࡜࡛㏦ಙࢆ࢟ࣕࣥࢭࣝࡍࡿ᪉ᘧ࡛࠶ࡿ㸬n ࡣ. NodePositionX. ㌴୧ࡢ X ᗙᶆ. 㜈್࡟ࡼࡗ࡚Ỵࡵࡽࢀࡿ㸬. NodePositionY. ㌴୧ࡢ Y ᗙᶆ. (d)Distance-Based Broadcast[8]. Speed. ㌴୧ࡢ㏿ᗘ. DirectionofMove. ㌴୧ࡢ㐍⾜᪉ྥ. CurrentTime. ⌧ᅾ᫬้. VANET ࡟࠾ࡅࡿ㊥㞳࣮࣋ࢫࡢ࣐ࣝࢳ࣍ࢵࣉࣈ࣮ࣟࢻ࢟ ࣕࢫࢺࡢ୰⥅㌴୧㑅ᢥ᪉ᘧ࡛࠶ࡾ㸪ࣃࢣࢵࢺࢆཷಙࡋ࡚࠿ ࡽ୰⥅ࡍࡿࡲ࡛࡟ཷಙ⪅࡜㏦ಙ⪅ࡢ㊥㞳࡟ᛂࡌ࡚ኚ໬ࡍࡿ ⥺ᙧⓗ࡞ᚅᶵ᫬㛫ࢆ⏝࠸ࡿࡇ࡜࡛ᐇ⌧ࡍࡿ㸬ཷಙ⪅࡜㏦ಙ. 4.2.2 ୰⥅㌴୧ࡢ㑅ᢥ(ᇶᮏⓗ࡞㑅ᢥ᪉ἲ). ⪅ࡢ㊥㞳ࡀ㛗ࡅࢀࡤ㏦ಙᚅᶵ᫬㛫ࡣ▷ࡃ࡞ࡾ㸪ඃඛⓗ࡟㏦. ྛ㌴୧ࡣ๓㏙ࡢ┦஫ࡢ㌴୧఩⨨ᢕᥱᶵ⬟࡛᱁⣡ࡋࡓ఩. ಙ࡛ࡁࡿ㸬ࡶࡋ㸪㏦ಙᚅᶵ୰࡟ྠ୍ࡢ᝟ሗࢆཷಙࡋࡓሙྜ. ⨨᝟ሗࢆ౑⏝ࡋ㸪㏦ಙ㌴୧ࡢ఩⨨࡜⮬㌴୧ࡢ఩⨨࠿ࡽ୰⥅. ࡣ௚ࡢ㌴୧ࡀ୰⥅ࡋࡓࡇ࡜ࢆㄆ▱ࡋ㸪㏦ಙࢆ࢟ࣕࣥࢭࣝࡋ. ඃඛᗘࢆỴᐃࡍࡿ㸬୰⥅ࡀᚲせ࡞᝟ሗࢆཷࡅྲྀࡗࡓ㌴୧ࡣ. ࡚෕㛗࡞㏻ಙࢆᢚไࡍࡿ㸬. ཷಙࡋࡓࣃࢣࢵࢺ࠿ࡽ㏦ಙ⪅ࡢ఩⨨᝟ሗࢆྲྀᚓࡋ㸪⮬㌴୧ ࡜ࡢ㊥㞳ࢆィ⟬ࡍࡿ㸬ࡑࡢᚋ㸪࿘ᅖࡢ㌴୧࡜㏦ಙ㌴୧ࡢ㊥. 3.2 ඛ⾜◊✲ࡢၥ㢟Ⅼ 1). Probablistic Scheme㸪Counter-Based Scheme ࡢၥ㢟Ⅼ ࣛࣥࢲ࣒࡞ᚅࡕ᫬㛫ࡢタᐃ࡟ࡼࡾ㸪୰⥅ࡍ࡭ࡁࣀ࣮ࢻ(㌴. ୧)ࡀ༢୍࡟⤠ࡽࢀ࡞࠸ࡇ࡜࡟ࡼࡾ෕㛗࡞㏻ಙࡀ⾜ࢃࢀࡿ. 㞳ࢆ⟬ฟࡋ㸪⮬㌴୧ࡢ୰⥅ඃඛᗘࢆỴᐃࡍࡿ㸬ࣃࢣࢵࢺࢆ ཷಙࡋࡓࡍ࡭࡚ࡢ㌴୧ࡀྠ୍఩⨨᝟ሗ࡟ᇶ࡙࠸࡚ฎ⌮ࢆࡍ ࡿࡇ࡜࡟ࡼࡾ࿘㎶㌴୧㛫࡛ඹ㏻ࡢ୰⥅ඃඛᗘࡀඹ᭷ࡉࢀࡿ㸬 ୰⥅ඃඛᗘࡀ 1 ࡢ᫬㸪᭱ࡶඃඛࡉࢀ㸪ඃඛᗘࡢ᭱኱್ࡣᚋ. Ⅼࡸ㏦ಙ⪅࠿ࡽ᭱ࡶ㐲࠸ࣀ࣮ࢻ(㌴୧)ࡀ㑅ᢥࡉࢀ࡞࠸ྍ⬟. ㏙ࡢ PRIORITY_MAX ࡜ࡋ࡚ືⓗ࡟ኚ᭦ࡍࡿ㸬ᅗ 2 ࡟♧ࡍ㸪. ᛶࡀ࠶ࡿࡇ࡜࠿ࡽ㐲᪉ࡢࣀ࣮ࢻ(㌴୧)࡬᝟ሗࢆఏ㐩ࡍࡿ㝿. ㊥㞳࡟ࡼࡾ୰⥅ඃඛᗘࢆ⟬ฟࡍࡿ᪤Ꮡ᪉ᘧ࡜ࡣ␗࡞ࡾ㸪ᅗ. ࡟୰⥅ᅇᩘࡀቑ࠼㸪ຠ⋡ⓗ࡛࡞࠸୰⥅ࡀ⾜ࢃࢀࡿၥ㢟Ⅼࡀ. 3 ࡛♧ࡍࡼ࠺࡟㏦ಙඖ㌴୧࠿ࡽࡢ㊥㞳࡛ࡣ࡞ࡃ㡰␒࡟ࡼࡾ. ࠶ࡿ㸬. Ỵᐃࡍࡿ㸬⟬ฟࡋࡓ୰⥅ඃඛᗘ࡟ᛂࡌ࡚㸪ྛ㌴୧ࡢ㏦ಙᚅ ᶵ᫬㛫(ᚋ㏙)ࢆタᐃࡍࡿࡇ࡜࡛୰⥅ᶵ఍࡟ᕪࢆࡘࡅࡿࡇ࡜ ࡟ࡼࡾ᪤Ꮡ᪉ᘧ࡛ࡣ㏻ಙࡀ⾪✺ࡋ࡚࠸ࡓၥ㢟ࢆᅇ㑊ྍ⬟࡜. ⓒ 2015 Information Processing Society of Japan. 2.

(3) Vol.2015-ITS-60 No.4 2015/3/4. ᝟ሗฎ⌮Ꮫ఍◊✲ሗ࿌ IPSJ SIG Technical Report ࡍࡿ㸬୰⥅ඃඛᗘࡣ㏦ಙ⪅࠿ࡽ᭱ࡶ㐲᪉࡟࠶ࡿ㌴୧ࡀ᭱ࡶ 㧗ࡃ㸪➼㊥㞳࡟௚ࡢ㌴୧ࡀ࠸ࡿሙྜࡣ㌴୧ ID ࢆẚ㍑ࡋ㸪ᑠ. WaitTime(ᚅᶵ᫬㛫) = DIFS + RelayPriority * SLOT_TIME. ࡉ࠸㌴୧ࢆඃඛࡍࡿ㸬ࡲࡓ㸪ྛ㌴୧ࡣ㸪୰⥅๓࡟௚ࡢ㌴୧. (2). ࡢ୰⥅ࢆ☜ㄆࡋࡓࡽ୰⥅ࢆ࢟ࣕࣥࢭࣝࡍࡿࡇ࡜࡛෕㛗ࣃࢣ RelayPriority:୰⥅ඃඛᗘ. ࢵࢺࡢఏᦙࢆᢚไࡍࡿ㸬 ࡲࡓ㸪఩⨨᝟ሗࡣ 700Mhz ᖏ࡛஺᥮ࡉࢀࡿࡓࡵ㸪⊃ᇦ஺ ㏻᝟ሗࢆඹ᭷ࡍࡿ 5.8GHz ᖏࡼࡾࡶ㐲ࡃࡲ࡛㟁Ἴࡀ฿㐩ࡍ. 㸦㸰㸧஺ᕪ㐨㊰࡟Ꮡᅾࡍࡿ㌴୧࡟ᑐࡍࡿ୰⥅ඃඛᗘ๭ᙜ. ࡿࡇ࡜࠿ࡽ㸪ྛ㌴୧ࡀྲྀᚓࡋ࡚࠸ࡿ఩⨨᝟ሗ࡟ᇶ࡙ࡁࡍ࡭. ஺ᕪ㐨㊰࡟Ꮡᅾࡍࡿ㌴୧ࡢ୰⥅ࡣ㌴୧ࡢ㐍⾜᪉ྥ࡜ࡣ. ࡚࡟୰⥅ඃඛᗘࢆ௜୚ࡋࡓሙྜ㸪ᐇ㝿ࡢ஺㏻᝟ሗࡢ㏻ಙ࡛. ␗࡞ࡿ᪉ྥ࡬ࡢ᝟ሗᣑᩓ࡟᭷ຠ࡛࠶ࡿࡓࡵ㸪᝟ሗࢆཷಙࡋ. ࡣ㟁Ἴࡀ฿㐩ࡋ࡞࠸ྍ⬟ᛶࡀ࠶ࡿ㸬ࡑࡢࡓࡵ㸪᝿ᐃࡉࢀࡿ. ࡓ㌴୧ࡀ㏦ಙ⪅࠿ࡽ␗࡞ࡿ᪉ྥ࡟Ꮡᅾࡍࡿሙྜ㸪┤⥺᪉ྥ. 5.8GHz ࡛ࡢ㏻ಙྍ⬟㊥㞳ෆ(౛࠼ࡤ 380m ࡜タᐃ)࡛ࡢࡳ୰. ࡢ㌴୧࡬๭ᙜ࡚ࡽࢀࡿ୰⥅ඃඛᗘ࡜ࡣ㔜」ࡋ࡞࠸୰⥅ඃඛ. ⥅ඃඛᗘࢆ௜୚ࡍࡿࡇ࡜࡛㐺ษ࡞୰⥅㌴୧ࡢ㑅ᢥไᚚࢆྍ. ᗘࢆ๭ᙜ࡚ࡿ㸬. ⬟࡜ࡍࡿ㸬㸦㸱㸧୰⥅ඃඛᗘࡢ๭ᙜ㌴୧ྎᩘࡢືⓗኚ᭦ 㸦㸯㸧㏦ಙᚅᶵ᫬㛫. ୰⥅ඃඛᗘࢆタᐃࡋ㸪୰⥅ࡀྍ⬟࡜࡞ࡿ㌴୧ࡢྎᩘࢆ. ୰ ⥅ ඃ ඛ ᗘ ࡟ ࡼ ࡾ ⟬ ฟ ࡉ ࢀ ࡿ ㏦ ಙ ᚅ ᶵ ᫬ 㛫 ࡣ MAC. PRIORITY_MAX ࡜ࡋ࡚⾲⌧ࡍࡿ㸬୰⥅ඃඛᗘࡣ㸪᝟ሗࢆཷ. 㸦Media Access Control㸧ᒙ࡟ᐇ⿦ࡉࢀࡿ㸬MAC ᒙ࡛ࡢ㏦ಙ. ಙࡋࡓ඲࡚ࡢ㌴୧࡟௜୚ࡍࡿࢃࡅ࡛ࡣ࡞ࡃ㸪㏻ಙ≧ἣ࡟ࡼ. ᚅᶵ᫬㛫ࡣࣂࢵࢡ࢜ࣇ᫬㛫࡜࿧ࡤࢀ㸪Counter-Based Scheme. ࡗ࡚ኚ໬ࡍࡿ PRIORITY_MAX ࡢ್ࡢྎᩘ࡟௜୚ࡍࡿ㸬๭. ࡛ࡣ㸪ᘧ(1)࡛⾲ࡉࢀࡿࡼ࠺࡟ DIFS(Distributed coordination. ᙜྎᩘ(PRIORITY_MAX)ࡀ 3 ࡜ 5 ࡢ᫬ࡢ๭ᙜ౛ࢆᅗ 4 ࡟♧. function Interframe Space)࡜࿧ࡤࢀࡿᅛᐃ㛗ࡢᚅᶵ᫬㛫࡜ࢥ. ࡍ㸬. ࣥࢸࣥࢩࣙࣥ࢘࢕ࣥࢻ࢘ࡢ⠊ᅖෆ࡛㑅ᢥࡉࢀࡿࣛࣥࢲ್࣒ ࢫࣟࢵࢺࢱ࢖࣒࡟ࡼࡾỴᐃࡉࢀࡿࡀ㸪ᥦ᱌᪉ᘧ࡛ࡣᘧ(2) ࡟ࡼࡾỴᐃࡍࡿ㸬 WaitTime(ᚅᶵ᫬㛫) = DIFS + Random_NUM(CW_MIN , CW_MAX). (1). * SLOT_TIME CW_MIN:ࢥࣥࢸࣥࢩࣙࣥ࢘࢕ࣥࢻ࢘᭱ᑠ್ CW_MAX:ࢥࣥࢸࣥࢩࣙࣥ࢘࢕ࣥࢻ࢘᭱኱್ ᅗ 4 ୰⥅ඃඛᗘࡢ๭ᙜ౛. ᅗ 2 Distance Based Broadcast ࡟ࡼࡿ୰⥅㌴୧㑅ᢥ. ᅗ 3 ᥦ᱌᪉ᘧ࡟ࡼࡿ୰⥅㌴୧㑅ᢥ. ⓒ 2015 Information Processing Society of Japan. 3.

(4) Vol.2015-ITS-60 No.4 2015/3/4. ᝟ሗฎ⌮Ꮫ఍◊✲ሗ࿌ IPSJ SIG Technical Report ๭ᙜྎᩘࢆᑠࡉࡃࡋࡓሙྜ㸪㏦ಙ⪅࠿ࡽ㐲࠸㌴୧ࡢࡳࡀ ୰⥅ࡍࡿࡇ࡜࡛ຠ⋡ⓗ࡞᝟ሗࡢᣑᩓࡀྍ⬟࡛࠶ࡿࡀ㸪ࡑࡢ ㌴୧ࡀ㞃ࢀ➃ᮎၥ㢟➼࡟ࡼࡾ᝟ሗࢆཷಙ࡛ࡁ࡞࠿ࡗࡓሙྜ㸪 ࡑࢀ௨ୖ᝟ሗࡢᣑᩓࡀ⾜ࢃࢀ࡞࠸࡜࠸࠺ၥ㢟Ⅼࡀ࠶ࡿ㸬. Counter-Based Scheme[7]㸪 Distance-Based Broadcast[8]ࢆᑐ ㇟࡜ࡋࡓ㸬 ᥦ᱌᪉ᘧ࡜ẚ㍑᪉ᘧࡢホ౯㡯┠ࡣ㸪᝟ሗ⏕ᡂ㛫㝸ࢆኚ໬ ࡉࡏࡓ࡜ࡁࡢ㸪1)᝟ሗᣑᩓ⋡㸪2)⥲㏻ಙᅇᩘ㸪3)࢚࣮࣮ࣛࣞ. ๭ᙜྎᩘࢆ኱ࡁࡃࡋࡓሙྜ㸪୰⥅ࡀ⾜ࢃࢀࡓࡇ࡜ࢆ㏻ಙ. ࢺ㸪4)ᖹᆒ㐜ᘏ᫬㛫࡜ࡍࡿ㸬ࡲࡓ㸪ᥦ᱌᪉ᘧ࡟࠾ࡅࡿ୰⥅. ࡢ⾪✺➼࡟ࡼࡗ࡚☜ㄆ࡛ࡁ࡞࠿ࡗࡓሙྜ㸪୙せ࡞୰⥅ࢆ⾜. ඃඛᗘࡢ๭ᙜ㌴୧ྎᩘࡢືⓗኚ᭦ᶵ⬟࡜஺ᕪ㐨㊰㌴୧࡬ࡢ. ࡗ࡚ࡋࡲ࠺ၥ㢟ࡀ࠶ࡿ㸬. ୰⥅ඃඛᗘ๭ᙜᶵ⬟ࡢホ౯㸪࡞ࡽࡧ࡟ 700MHz ᖏࢆ฼⏝ࡋ. ᥦ᱌᪉ᘧ࡟࠾ࡅࡿฎ⌮ࣇ࣮ࣟࢆᅗ 5 ♧ࡍ㸬ࣃࢣࢵࢺࡣ ⾲ 2 ࡟♧ࡍ᝟ሗࢆྵࡴࡶࡢ࡜ࡍࡿ㸬. ࡓ఩⨨᝟ሗ஺᥮ࡢṇ☜ᛶホ౯ࡶ⾜ࡗࡓ㸬ホ౯࡛ࡣ㸪ࢩ࣑ࣗ ࣮ࣞࢩࣙࣥ᫬㛫ෆ࡟࠾ࡅࡿᖹᆒ್ࢆ౑⏝ࡍࡿ㸬 5.1.1 ẚ㍑᪉ᘧࡢᐇ⿦ 㸦㸯㸧Counter-Based Scheme(ẚ㍑᪉ᘧ 1) ྛ㌴୧ࡣ᝟ሗࢆ⏕ᡂࡋ㸪Ⓨಙࡍࡿ㸬᝟ሗࢆཷಙࡋࡓ㌴୧ ࡣ㸪ࣛࣥࢲ࣒࡞㏦ಙᚅᶵ᫬㛫ࡢ⤊஢ᚋ࡟㏦ಙࡍࡿ㸬㏦ಙᚅ ᶵ᫬㛫ࡣ௨ୗࡢᘧ࡟ࡼࡿ㸬 WaitTime=Random(0.1 – 0.5)*SECOND. (3). ㏦ಙᚅᶵ᫬㛫࡟ྠ୍ࡢࣃࢣࢵࢺࢆ㜈್ n ᅇཷಙࡍࡿࡇ࡜ ࡛㏦ಙࢆ࢟ࣕࣥࢭࣝࡍࡿ㸬௒ᅇ㸪n=1 ࡜ࡍࡿ㸬㸦㸰㸧Distance-Based Broadcast(ẚ㍑᪉ᘧ 2) ㏻ಙྍ⬟㊥㞳ࢆ௵ពࡢศ๭ࡍࡿࢭࢡࢱᩘ࡛㝖ࡋ㸪㏦ಙ㌴ ୧࡜ཷಙ㌴୧ࡢ㊥㞳ࢆィ⟬ࡋ㸪⮬㌴୧ࡀఱ␒┠ࡢࢭࢡࢱ࡟ Ꮡᅾࡍࡿ࠿࡟ࡼࡾᚅᶵ᫬㛫ࢆタᐃࡍࡿ㸬ᚅᶵ᫬㛫ࡣ௨ୗࡢ ᘧ࡟ࡼࡿ㸬࡞࠾㸪ࡇࡇ࡛ࡣ㸪SPLITNUM=100 㸪 Distance = 380 ࡜ࡍࡿ㸬 ᅗ 5 ᥦ᱌᪉ᘧࡢฎ⌮ࣇ࣮ࣟ ⾲ 2 ࣃࢣࢵࢺࡢᵓ㐀. ‫ כ‬

(5) . (4). ሺͲǤͷ െ ͲǤͳሻ ‫ݎ݋ݐܿ݁ܵݕܯ כ‬ ܵܲ‫ܯܷܰܶܫܮ‬. (5). ሾ ሿ ൌ ൌ. 㡯┠. ㄝ᫂. BroadcastTime. ᝟ሗࢆ⏕ᡂࡋࡓ᫬㛫. SourceNodeId. ᝟ሗ⏕ᡂࡋࡓ㌴୧␒ྕ. MySector:⮬ศࡢࢭࢡࢱ␒ྕ 㸪 Distance:㏦ಙ⪅࠿ࡽࡢ㊥㞳㸪. SourceNodePositionX. ᝟ሗࢆ⏕ᡂࡋࡓ㌴୧ࡢ X ᗙᶆ. SPLITNUM:ࢭࢡࢱศ๭ᩘ 㸪 MAXRANGE:㏻ಙྍ⬟㊥㞳㸬. SourceNodePositionY. ᝟ሗࢆ⏕ᡂࡋࡓ㌴୧ࡢ Y ᗙᶆ. maxHopCount. ᭱኱࣍ࢵࣉᩘ. counterThreshold. ୰⥅ᅇᩘࡢ㜈್. RelayPriority. ୰⥅ඃඛᗘ. RelayNodeId. ୰⥅㌴୧ࡢ㌴୧␒ྕ. EventData. ࢖࣋ࣥࢺࢹ࣮ࢱ. 5.2 ࢩ࣑࣮ࣗࣞࢩࣙࣥ᮲௳ ஺ᕪⅬ㛫㝸 400m ࡛ 44 ࡢࢢࣜࢵࢻ≧ࡢ࣐ࢵࣉ࡟ 500 ྎ ࡢ㌴୧ࢆ㓄⨨ࡍࡿ㸬㐨㊰௨እࡢ㒊ศ࡟ࡣᘓ≀ࡀᏑᅾࡋ㸪ྛ ஺ᕪⅬ࡟ࡣಙྕᶵࡀタ⨨ࡍࡿ㸬ྛࣀ࣮ࢻࡣࣛࣥࢲ࣒࡟Ỵᐃ ࡉࢀࡓึᮇ఩⨨࠿ࡽࣛࣥࢲ࣒࡟⛣ືࡋ㸪୍ᐃ㛫㝸࡛᝟ሗࢆ ⏕ᡂࡍࡿ㸬㟁Ἴఏᦙࣔࢹࣝࡣᘓ≀࡟ࡼࡿ㟁Ἴࡢ㐽ⶸࢆ⪃៖ ࡍࡿ ITU-R P.1411 ࡢᶆ‽࡟ᚑ࠺㸬୺࡞ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢ. 5. ࢩ࣑࣮ࣗࣞࢩࣙࣥホ౯. タᐃ್ࢆ⾲ 3 ࡟♧ࡍ㸬. 5.1 ࢩ࣑࣮ࣗࣞࢩࣙࣥᴫせ ᥦ᱌᪉ᘧࡢ᭷ຠᛶࢆࢩ࣑࣮ࣗࣞࢩࣙࣥ࡟ࡼࡾ᳨ドࡍࡿ ࡓࡵ㸪ᥦ᱌᪉ᘧ࡜ 3 ⠇࡛㏙࡭ࡓẚ㍑᪉ᘧࢆỗ⏝ࢿࢵࢺ࣮࣡ ࢡ ࢩ ࣑ ࣗ ࣞ ࣮ ࢱ Scenargie[10] ࡟ ᐇ ⿦ ࡋ ࡓ 㸬 ẚ ㍑ ᪉ ᘧ ࡣ. ⓒ 2015 Information Processing Society of Japan. 4.

(6) Vol.2015-ITS-60 No.4 2015/3/4. ᝟ሗฎ⌮Ꮫ఍◊✲ሗ࿌ IPSJ SIG Technical Report ⾲ 3 ࢩ࣑࣮ࣗࣞࢩࣙࣥタᐃ್ ್. ㏻ಙ᪉ᘧ. IEEE 802.11p. ఏ㏦㏿ᗘ. 3Mbps. ࿘Ἴᩘᖏ. 5.8GHz. ࣃࢣࢵࢺࢧ࢖ࢬ. 128byte – 512byte. ᭱኱࣍ࢵࣉᩘ. 100. 㟁Ἴఏᦙࣔࢹࣝ. ITU-R P.1411. ᝟ሗ⏕ᡂ㛫㝸. 0.5s/ྎ-8s/ྎ. ホ౯࢚ࣜ࢔. 1.6km x 1.6km. ஺ᕪⅬ㛫㝸. 400m. ಙྕࡢ᭷↓. ᭷(඲࡚ࡢ஺ᕪⅬ). ㌴⥺ᩘ. 2. ㌴୧఩⨨. ࣛࣥࢲ࣒. ㌴୧ྎᩘ. 500 ྎ. ㌴୧㛗. 5m. ㌴୧㏿ᗘ. 30km/h-60km/h. ࢩ࣑࣮ࣗࣞࢩࣙࣥ᫬㛫. 120s. ヨ⾜ᅇᩘ. 30. ༓. 㡯┠. 25. 20. ᥦ᱌᪉ᘧ ẚ㍑᪉ᘧ1. ᝟ 15 ሗ ᩘ 10. ẚ㍑᪉ᘧ2. 5 0. ᣑᩓ⋡ ᅗ 7 ᪉ᘧูࡢᣑᩓ⋡ศᕸ 5.4 ㏻ಙᅇᩘ࡜ಙ㢗ᛶ࡟㛵ࡍࡿホ౯࡜⪃ᐹ ᅗ 8 ࡟᝟ሗ⏕ᡂ㛫㝸ࢆኚ໬ࡉࡏࡓ࡜ࡁࡢ⥲㏦ಙᅇᩘࢆ♧. 5.3 ᝟ሗᣑᩓ⋡࡟㛵ࡍࡿホ౯࡜⪃ᐹ 8s-0.5s ࡲ࡛᝟ሗ⏕ᡂ㛫㝸ࢆኚ໬ࡉࡏࡓ࡜ࡁࡢᖹᆒᣑᩓ⋡ ࢆᅗ 6 ࡟♧ࡍ㸬ᅗ 6 ࡼࡾ㸪඲࡚ࡢ᝟ሗ⏕ᡂ㛫㝸࡛ᥦ᱌᪉ᘧ ࡀ᭱ࡶᣑᩓ⋡ࡀ㧗ࡃ㸪≉࡟᝟ሗ⏕ᡂ㛫㝸ࡀ 0.5s ࡢ᫬࡟ẚ㍑ ᪉ᘧ 1(Counter-Based Scheme)ࡼࡾࡶᣑᩓ⋡ࡀ᭱኱ 35.0%ྥ ୖࡋ࡚࠸ࡿ㸬ࡲࡓẚ㍑᪉ᘧ 2 (Distance-Based Broadcast )࡛ࡣ 2.7%࠿ࡽ 32%࡟ྥୖࡋ࡚࠸ࡿ㸬ࢩ࣑࣮ࣗࣞࢩ࡛ࣙࣥࡣ㸪ಙ ྕ࡟ࡼࡾ஺ᕪⅬ௜㏆࡟㌴୧ࡀከࡃᏑᅾࡍࡿࡓࡵ㸪ẚ㍑᪉ᘧ 2 ࠾࠸࡚㏻ಙࡀ⾪✺ࡋࡸࡍ࠸ࡇ࡜ࡀཎᅉ࡛㸪ẚ㍑᪉ᘧ 2 ࡀ ᭱ࡶᝏ࠸⤖ᯝ࡟࡞ࡗࡓ࡜⪃࠼ࡽࢀࡿ㸬 ࡲࡓ㸪᝟ሗ⏕ᡂ㛫㝸 8s ࡢ᫬ࡢ᪉ᘧࡈ࡜ࡢᣑᩓ⋡ศᕸࢆᅗ 7 ࡟♧ࡍ㸬ᥦ᱌᪉ᘧ࡛ࡣᣑᩓ⋡ 100%ࡢ᝟ሗࡢಶᩘࡀ᭱ࡶከ ࠸⤖ᯝ࡜࡞ࡗࡓࡇ࡜ࡼࡾ㸪᭱㐲㌴୧ࡢ୰⥅ࡸࣃࢣࢵࢺࡢ⾪ ✺ࢆᅇ㑊ࡍࡿࡇ࡜࡛ࡼࡾከࡃࡢ㌴୧࡬᝟ሗࢆᣑᩓ࡛ࡁ࡚࠸ ࡿࡇ࡜ࡀ☜ㄆ࡛ࡁࡿ㸬. ࡋ ࡓ 㸬 8s-2s ࡛ ࡣ ᥦ ᱌ ᪉ ᘧ ࡜ ẚ ㍑ ᪉ ᘧ 1(Counter-Based Scheme)ࡢ⥲㏦ಙᅇᩘࡣྠ➼࡛࠶ࡾ㸪1s㸪0.5s 㛫㝸࡛ࡣ⥲㏦ ಙᅇᩘࢆ᭱኱ 20.5%๐ῶ࡛ࡁ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡿ㸬඲࡚ࡢ ᝟ሗ⏕ᡂ㛫㝸࡛ẚ㍑᪉ᘧ 2 ࡢ㏦ಙᅇᩘࡀከࡃ࡞ࡗ࡚࠾ࡾ᝟ ሗ⏕ᡂ㛫㝸ࡀ 1s ࡢ᫬࡟ᥦ᱌᪉ᘧ࡛ࡣ᭱኱ 28.25%๐ῶ࡛ࡁ ࡚࠸ࡿ㸬 8s ࠿ࡽ 4s㸪4s ࠿ࡽ 2s ࡢ㛫㝸࡛᝟ሗࢆ⏕ᡂࡍࡿሙྜ㸪᫬ 㛫ᙜࡓࡾ࡛ಸࡢ᝟ሗࡀ⏕ᡂࡉࢀࡿࡇ࡜ࡼࡾྠ➼ࡢᣑᩓ⋡ࢆ ⥔ᣢࡍࡿࡓࡵ࡟ࡣ㸪⥲㏦ಙᅇᩘࡶ⣙ 2 ಸ࡟࡞ࡿࡣࡎ࡛࠶ࡿ㸬 ࡋ࠿ࡋ 2s ࠿ࡽ 1s ࠾ࡼࡧ 1s ࠿ࡽ 0.5s ࡛ࡣ⥲㏦ಙᅇᩘࡢቑ ຍ⋡ࡣ㕌໬ࡋ࡚࠾ࡾ㸪㏻ಙࢺࣛࣄࢵࢡ࡟✵ࡁࡀ࡞ࡃ࡞ࡗ࡚ ࠸ࡿࡇ࡜ࡀண᝿ࡉࢀࡿ㸬 ᅗ 6 ࡜ᅗ 8 ࢆేࡏ࡚ࡳࡿ࡜ẚ㍑᪉ᘧ 1 ࠾ࡼࡧẚ㍑᪉ᘧ 2 ࡛ࡣᥦ᱌᪉ᘧࡼࡾࡶ㏦ಙᅇᩘࡀከ࠸࡟ࡶ㛵ࢃࡽࡎᣑᩓ⋡ࡀ ྥୖࡋ࡚࠸࡞࠸㸬ࡇࡢ⤖ᯝ࠿ࡽ㸪ᥦ᱌᪉ᘧ࡛ࡣ୍ᅇࡢ㏦ಙ ࡛ࡼࡾከࡃࡢ㌴୧ࡀ᝟ሗࢆྲྀᚓ࡛ࡁ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡿ㸬. 100. ᑐࡋ࡚㸪ẚ㍑᪉ᘧ 1 ࠾ࡼࡧẚ㍑᪉ᘧ 2 ࡛ࡣྠ୍ࡢ᝟ሗࡀ」. 80. ᩘᅇ୰⥅ࡉࢀ࡚࠸ࡿࡇ࡜ࡸࣃࢣࢵࢺࡢ⾪✺࡟ࡼࡗ࡚ຠ⋡ⓗ ࡞᝟ሗᣑᩓࡀ⾜ࢃࢀ࡚࠸࡞࠸࡜ண᝿ࡉࢀࡿ㸬. 60. ẚ㍑᪉ᘧ1. ᥦ᱌᪉ᘧ. 20 %. (. ẚ㍑᪉ᘧ2. ᣑ ᩓ 40 ⋡ ). 0 8. 6.5. 5. 3.5. 2. 0.5. ᝟ሗ⏕ᡂ㛫㝸(⛊) ᅗ 6 ᝟ሗ⏕ᡂ㛫㝸࡜ᣑᩓ⋡. ⓒ 2015 Information Processing Society of Japan. 5.

(7) Vol.2015-ITS-60 No.4 2015/3/4. ᝟ሗฎ⌮Ꮫ఍◊✲ሗ࿌ IPSJ SIG Technical Report. ୓. 5.5 㐜ᘏ᫬㛫࡟㛵ࡍࡿホ౯࡜⪃ᐹ 450. ᅗ 10 ࡣ᝟ሗ⏕ᡂ㛫㝸ࢆኚ໬ࡉࡏࡓ࡜ࡁࡢᖹᆒ㐜ᘏ᫬㛫. 400. ẚ㍑᪉ᘧ1. ࢆ♧ࡍ㸬ᥦ᱌᪉ᘧ࡛ࡣẚ㍑᪉ᘧ 1(Counter-Based Scheme)ࡼ. 350. ẚ㍑᪉ᘧ2. ࡾࡶ᝟ሗ⏕ᡂ㛫㝸 2s ࡢ࡜ࡁ࡟᭱኱࡛ 55.3%㸪ẚ㍑᪉ᘧ. 300. ㏦ ಙ 250 ᅇ 200 ᩘ 150. 2(Distance-Based Broadcast )ࡼࡾࡶ 62.9%㐜ᘏ᫬㛫ࢆపῶࡋ. ᥦ᱌᪉ᘧ. ࡚࠸ࡿ㸬ᥦ᱌᪉ᘧ࡛ࡣ㸪㏦ಙ⪅࠿ࡽ᭱ࡶ㐲ࡃࡢ㌴୧ࢆ୰⥅ ㌴୧࡟㑅ᢥࡍࡿࡇ࡜࡟ࡼࡾ᝟ሗࡢ࣍ࢵࣉᩘࢆῶᑡࡉࡏࡿⅬ ࡸ஺ᕪ㐨㊰ࡢ㌴୧ࢆ୰⥅㌴୧࡜㑅ᢥࡍࡿࡇ࡜࡛㐜ᘏ᫬㛫ࡢ. 100. ቑ኱ࢆ㜵ࡆ࡚࠸ࡿⅬࡀ኱ࡁࡃᐤ୚ࡋ࡚࠸ࡿ㸬ࡲࡓᥦ᱌᪉ᘧ. 50. ࡜ẚ㍑᪉ᘧ 1 ࡟࠾࠸࡚᝟ሗ⏕ᡂ㛫㝸ࡀ 1s ࡢ᫬ࡼࡾࡶ 0.5s. 0. ࡢ᫬࡟㐜ᘏ᫬㛫ࡀῶᑡࡋ࡚࠸ࡿ⌮⏤࡜ࡋ࡚㸪0.5s ࡢሙྜ࡟ 8s. 4s. 2s. 1s. 0.5s. ᝟ሗ⏕ᡂ㛫㝸(⛊). ࡣࢺࣛࣄࢵࢡࡀᅽ㏕ࡉࢀ୰⥅ࡢ㝿࡟ࢹ࣮ࢱࡀኻࢃࢀ࡚ࡋࡲ ࠺ࡇ࡜࡛㸪ᑡ࡞࠸࣍ࢵࣉᩘࡢ᝟ሗࡢ㐜ᘏ᫬㛫ࡢࡳࡀ⤫ィ್ ࡜ࡋ࡚ᚓࡽࢀ࡚࠸ࡿࡇ࡜ࡀཎᅉ࡜⪃࠼ࡽࢀࡿ㸬ẚ㍑᪉ᘧ 2㸪. ᅗ 8 ᝟ሗ⏕ᡂ㛫㝸࡜㏦ಙᅇᩘ. ᥦ᱌᪉ᘧࡢ᝟ሗ⏕ᡂ㛫㝸 2s ࠿ࡽ 1s ࡢ⤖ᯝ࡛ࡶྠᵝࡢ⌧㇟ ᅗ 9 ࡼࡾ㸪᝟ሗ⏕ᡂ㛫㝸 1s㸪05s ࡢ᫬㸦㧗ࢺࣛࣄࢵࢡࡢ. ࡀ㉳ࡁ࡚࠸ࡿ࡜⪃࠼ࡽࢀࡿ㸬. ᫬㸧㸪ᥦ᱌᪉ᘧ࡛ࡣ࢚࣮࣮ࣛࣞࢺࡀẚ㍑᪉ᘧ 1(Counter-Based Scheme)࠾ࡼࡧẚ㍑᪉ᘧ 2(Distance-Based Broadcast )ࡼࡾࡶ ẚ㍑᪉ᘧ1. ప࠸್࡛ᢚ࠼ࡽࢀ࡚࠸ࡿࡇ࡜࡟ࡼࡾಙ㢗ᛶࡢ㧗࠸㏻ಙࡀ࡛ ࡁ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡿ㸬୍᪉࡛㸪8s-2s ࡢ᫬࡟࢚࣮࣮ࣛࣞࢺ ࡀᥦ᱌᪉ᘧ࡛ⱝᖸ㧗࠸್ࢆ♧ࡋ࡚࠸ࡿࡢࡣ㸪ࢺࣛࣄࢵࢡ࡟ ✵ࡁࡀ࠶ࡿሙྜ࡟ࡣᣑᩓ⋡ࢆ㧗ࡵࡿࡓࡵ࡟୰⥅ඃඛᗘ๭ᙜ ྎᩘࢆ㧗࠸್࡟ືⓗ࡟タᐃࡋ᝟ሗࡢᣑᩓ࡟෕㛗ᛶࢆᣢࡓࡏ ࡚࠸ࡿࡇ࡜ࡀཎᅉ࡜⪃࠼ࡽࢀࡿ㸬 ࡕࡢ㌴୧࡞࡝㏆ࡃࡢ఩⨨࡟」ᩘࡢ㌴୧ࡀᏑᅾࡍࡿሙྜ㸪㏻ ಙࡀ࠿࡞ࡽࡎ⾪✺ࡋ࡚ࡋࡲ࠺ࡓࡵ࢚࣮࣮ࣛࣞࢺ࡛ࡣᥦ᱌᪉. ᥦ᱌᪉ᘧ. 1400 ᖹ ᆒ 1200 㐜 1000 ᘏ ᫬ 800 㛫 600 䢌䢔 400 ⛊ 200. (. ẚ㍑᪉ᘧ 2(Distance-Based Broadcast )࡟ࡘ࠸࡚ࡣ㸪ಙྕᚅ. ẚ㍑᪉ᘧ2. 1600. ). ᘧ࠾ࡼࡧẚ㍑᪉ᘧ 1(Counter-Based Scheme)ࡼࡾࡶ㧗࠸್ࢆ ♧ࡋ࡚࠸ࡿ㸬. 0. 8s. 25. 4s 2s ᝟ሗ⏕ᡂ㛫㝸(⛊). 1s. 0.5s. ᅗ 10 ᝟ሗ⏕ᡂ㛫㝸࡜㐜ᘏ᫬㛫. ẚ㍑᪉ᘧ1 ẚ㍑᪉ᘧ2. 䜶 20 䝷呎 15 䝺呎 10 䝖. 5.6 ୰⥅ඃඛᗘࡢ๭ᙜ㌴୧ྎᩘࡢືⓗኚ᭦࡟㛵ࡍࡿホ౯࡜. ᥦ᱌᪉ᘧ. ⪃ᐹ ୰⥅ඃඛᗘࡢ๭ᙜྎᩘࡢ᭱኱್ࢆ 20㸪 50㸪 100 ࡜㟼ⓗ ࡞್࡟タᐃࡋ㸪᝟ሗ⏕ᡂ㛫㝸ࢆኚ໬ࡉࡏࡓ࡜ࡁࡢ⤖ᯝࢆᅗ 11 ࡟♧ࡍ㸬⤖ᯝ࠿ࡽ㸪๭ᙜྎᩘࢆከࡃタᐃࡋࡓሙྜ㸪㏻ಙ. ( ⠊ᅖෆ࡟࠸ࡿከࡃࡢ㌴୧࡟୰⥅ඃඛᗘࢆ๭ࡾᙜ࡚ࡿࡓࡵ㸪. ). % 5. ௬࡟㸪୰⥅࡟᭱㐺࡞㌴୧ࡀ᝟ሗࢆ୰⥅࡛ࡁ࡞࠿ࡗࡓሙྜ࡛ ࡶࡑࢀࡼࡾࡶ୰⥅ඃඛᗘࡢప࠸㌴୧ࡀ୰⥅ࡍࡿࡇ࡜࡛᝟ሗ. 0 8s. 4s. 2s. 1s. ᝟ሗ⏕ᡂ㛫㝸(⛊). 0.5s. ࡢᣑᩓࡀṆࡲࡿࡇ࡜ࢆ㜵ࡆࡿ฼Ⅼࡀ࠶ࡾ㸪᝟ሗ⏕ᡂ㛫㝸ࡀ 㛗࠸ሙྜ࡛ࡣᣑᩓ⋡ࢆ㧗ࡃಖ࡚ࡿࡇ࡜ࡀࢃ࠿ࡿ㸬 ୍᪉࡛㸪๭ᙜྎᩘࢆᑡ࡞ࡃタᐃࡋࡓሙྜ㸪୰⥅࡟᭱㐺࡞. ᅗ 9 ᝟ሗ⏕ᡂ㛫㝸࡜࢚࣮࣮ࣛࣞࢺ. ㌴୧ࡢࡳࡀ୰⥅ྍ⬟࡞㌴୧࡜࡞ࡿࡇ࡜࡛㸪ከࡃࡢ㏻ಙࡀ⾪ ✺ࡍࡿࡇ࡜࡟࡞ࡿ᝟ሗ⏕ᡂ㛫㝸ࡀ▷࠸ሙྜ࡛ࡣ㸪㸯ᅇࡢ㏻ ಙ࡛ከࡃࡢ㌴୧࡬᝟ሗࢆᣑᩓ࡛ࡁࡿࡇ࡜࡛ᣑᩓ⋡ࡀ㧗ࡃ࡞ ࡗ࡚࠸ࡿ࡜⪃࠼ࡽࢀࡿ㸬. ⓒ 2015 Information Processing Society of Japan. 6.

(8) Vol.2015-ITS-60 No.4 2015/3/4. ᝟ሗฎ⌮Ꮫ఍◊✲ሗ࿌ IPSJ SIG Technical Report. 5.8 700MHz ᖏࢆ฼⏝ࡋࡓ఩⨨᝟ሗ஺᥮ࡢಙ㢗ᛶ࡟㛵ࡍࡿ ホ౯ 100. ㌴୧㛫࡛఩⨨᝟ሗ➼࡜஺᥮ࡍࡿ 700MHz ࡢ㟁Ἴఏᦙ࡛ࡣ㸪 5.8GHz ࡜ẚ㍑ࡋ࡚ᗈ࠸⠊ᅖ࡛㏻ಙྍ⬟࡛࠶ࡿࡇ࡜ࡀࢃ࠿. 80. ࡗ࡚࠸ࡿ㸬ࡑࡢࡓࡵ㸪ࢩ࣑࣮ࣗࣞࢩ࡛ࣙࣥࡣ㸪ྛ㌴୧ࡀṇ. 60 ᣑ. ๭ᙜྎᩘ100. 40. ๭ᙜྎᩘ20. ᩓ ⋡. ࡀಖࡓࢀࡿ࠿ࢆ☜࠿ࡵࡿࡓࡵ࡟⡆᫆࡞ࢩ࣑࣮ࣗࣞࢩࣙࣥࢆ. %. ⾜ࡗࡓ㸬୺࡞ࢩ࣑࣮ࣗࣞࢩࣙࣥࡢタᐃ್ࡣ⾲ 4 ࡢ㏻ࡾ࡛࠶. ). ᥦ᱌᪉ᘧ. ࡟ 700MHz ᖏࡢ఩⨨᝟ሗࡢ஺᥮࡟࠾࠸࡚࡝ࡢ⛬ᗘࡢṇ☜ᛶ. (. ๭ᙜྎᩘ50. ☜࡞఩⨨᝟ሗࢆྲྀᚓࡋ࡚࠸ࡿ๓ᥦ࡛⾜ࡗࡓ㸬ࡋ࠿ࡋ㸪ᐇ㝿. ࡿ㸬. 20. ⾲ 4 700Mhz ᖏࢩ࣑࣮ࣗࣞࢩࣙࣥタᐃ್ 0 6.5. 4.5. 2.5. 0.5. ᝟ሗ⏕ᡂ㛫㝸(⛊) ᅗ 11 ඃඛᗘ๭ᙜྎᩘࡢኚ໬࡜ᣑᩓ⋡ 5.7 ஺ᕪ㐨㊰ࡢ㌴୧࡬ࡢ୰⥅ඃඛᗘࡢ๭ᙜ࡟㛵ࡍࡿホ౯࡜ ⪃ᐹ ᅗ 12 ࡟ࡣ஺ᕪ㐨㊰࡟Ꮡᅾࡍࡿ㌴୧࡟୰⥅ඃඛᗘࢆ๭ࡾ. 㡯┠. ್. ㏻ಙ᪉ᘧ. IEEE802.11p. ఏ㏦㏿ᗘ. 3Mbps. ࿘Ἴᩘᖏ. 760MHz. ࣃࢣࢵࢺࢧ࢖ࢬ. 128byte. ᭱኱࣍ࢵࣉᩘ. 1. ࢩ࣑࣮ࣗࣞࢩࣙࣥ᫬㛫. 120s. ヨ⾜ᅇᩘ. 10 ᅇ. ᙜ࡚ࡿᶵ⬟ࡢ᭷↓࡜ᣑᩓ⋡ࡢኚ໬ࢆ♧ࡍ㸬᝟ሗ⏕ᡂ㛫㝸ࡀ 㛗࠸ሙྜ㸪୰⥅ඃඛᗘࡢ๭ᙜ㌴୧ྎᩘࡣከࡃタᐃࡉࢀࡿࡢ. 700MHz ᖏࢆ฼⏝ࡋ࡚ 0.1s 㛫㝸࡟఩⨨᝟ሗࢆ஺᥮ࡋࡓሙ. ࡛㸪஺ᕪ㐨㊰㌴୧࡬ࡢ୰⥅ඃඛᗘ๭ᙜᶵ⬟ࡢ᭷↓࡟࠿࠿ࢃ. ྜࡢ࢚࣮࣮ࣛࣞࢺࢆᅗ 13 ࡟♧ࡋࡓ㸬ᅗ 13 ࡼࡾ࢚࣮࣮ࣛࣞ. ࡽࡎ୰⥅ྍ⬟㌴୧࡜ࡋ࡚㑅ᢥࡉࢀࡿ㸬ࡑࡢࡓࡵᣑᩓ⋡࡟኱. ࢺࡣ 2%-2.3%࡛Ᏻᐃࡋ࡚᥎⛣ࡋ࡚࠸ࡿࡇ࡜ࡀㄞࡳྲྀࢀࡿ㸬. ࡁ࡞ᕪࡣ࡛࡞࠸㸬୍᪉࡛㸪᝟ሗ⏕ᡂ㛫㝸ࡀ▷ࡃ࡞ࡿ࡜୰⥅. ࡇࡢ⤖ᯝ࠿ࡽ⣼✚್ࢆ⪃࠼ࡿ࡜ 0.2s 㛫㝸࡛ 99.94%-99.96%. ඃඛᗘࡢ๭ᙜ㌴୧ྎᩘࡣᑠࡉ࠸್࡟タᐃࡉࢀࡿࡓࡵ஺ᕪ㐨. ࡢ㌴୧ࡀṇ☜࡞఩⨨ࢆᢕᥱ࡛ࡁ࡚࠸ࡿ࡜᥎ ࡛ࡁࡿ㸪ࡉࡽ. ㊰ࡢ㌴୧ࡣ୰⥅ྍ⬟㌴୧࡜ࡋ࡚㑅ᢥࡉࢀ࡞࠸ሙྜࡀ࠶ࡿ㸬. ࡟ᥦ᱌᪉ᘧ࡛ᚲせ࡜ࡉࢀࡿ఩⨨᝟ሗࡢ⠊ᅖࡣ 5.8GHz ࡢ㟁. ⤖ᯝ࡜ࡋ࡚㸪஺ᕪ㐨㊰ࡢ㌴୧࡟୰⥅ඃඛᗘࢆ௜୚ࡍࡿࡇ࡜ ࡛ᣑᩓ⋡ࡢྥୖࡀᐇ⌧ࡉࢀ࡚࠸ࡿ࡜⪃࠼ࡽࢀࡿ㸬. Ἴ฿㐩⠊ᅖ࡛ࡼ࠸ࡢ࡛᭦࡟㧗࠸ಙ㢗ᛶ࡛఩⨨᝟ሗࡢ஺᥮ࡀ ྍ⬟࡜ᛮࢃࢀࡿࡓࡵ㸪఩⨨᝟ሗࡢ㱈㱒ࡀᥦ᱌᪉ᘧ࡟୚࠼ࡿ ᙳ㡪ࡣᑡ࡞࠸࡜⪃࠼ࡽࢀࡿ㸬. ஺ᕪ㐨㊰๭ᙜ↓. 2.5. 0.5. ᝟ሗ⏕ᡂ㛫㝸(⛊) ᅗ 12 ஺ᕪ㐨㊰ࡢ㌴୧࡬ࡢඃඛᗘ๭ᙜࡢ᭷↓࡜ᣑᩓ⋡. % ). 4.5. %. 䜶 2.3 䝷呎 2.25 䝺呎 2.2 䝖 (. 6.5. ᣑ ᩓ ⋡ ). ஺ᕪ㐨㊰๭ᙜ᭷. 2.35. (. 100 90 80 70 60 50 40 30 20 10 0. 2.15 2.1 0. 50. 100. 䝅䝭䝳䝺䞊䝅䝵䞁⤒㐣᫬㛫(⛊) ᅗ 13 700Mhz ᖏ㏻ಙ࡟࠾ࡅࡿ࢚࣮࣮ࣛࣞࢺ. ⓒ 2015 Information Processing Society of Japan. 7.

(9) Vol.2015-ITS-60 No.4 2015/3/4. ᝟ሗฎ⌮Ꮫ఍◊✲ሗ࿌ IPSJ SIG Technical Report. 6. ࡲ࡜ࡵ࡜௒ᚋࡢㄢ㢟 ᮏ✏࡛ࡣ㸪㌴㌴㛫㏻ಙ࡟ࡼࡾ㸪⊃ᇦ஺㏻᝟ሗࢆຠ⋡ⓗ࡟. [8]. ࿘ᅖࡢ㌴୧࡛ඹ᭷࡛ࡁࡿࡼ࠺࡟ࡍࡿࡓࡵ㸪Ᏻ඲㐠㌿ᨭ᥼ࢩ ࢫࢸ࣒࡛ 700MHz ᖏ࡟ࡼࡗ࡚஺᥮ࡉࢀࡿ࿘ᅖࡢ㌴୧ࡢ఩⨨㸪㏿ᗘ㸪⛣ື᪉ྥࡢ᝟ሗ࡟ᇶ࡙ࡃ㡰ᗎ௜ࡅ࡟ࡼࡾ୰⥅㌿㏦᪉. [9]. ᘧࢆᥦ᱌ࡋࡓ㸬ࢩ࣑࣮ࣗࣞࢩࣙࣥࢆ㏻ࡌ࡚㸪ᥦ᱌᪉ᘧࢆᑟ ධࡍࡿࡇ࡜࡛᪤Ꮡ᪉ᘧ࡜ẚ㍑ࡋ࡚ᣑᩓ⋡࡛᭱኱ 35.0%ྥୖ㸪㐜ᘏ᫬㛫࡛᭱኱ 55.3%పῶ㸪㏻ಙᅇᩘࢆ᭱኱࡛ 20.5%๐ῶ. [10]. international conference on Mobile computing and networking Sang-woo Chang, Sang-sun Lee,” A Study on Distance-based Multi-hop Broadcast Scheme for Inter-Vehicle Communication”, IT Convergence and Security (ICITCS), 2013 International Conference on ARIB(㟁Ἴ⏘ᴗ⏺) STD-T109 , http://www.arib.or.jp/english/html/overview/doc/1STD-T109v1_0.pdf Space-Time Engineering,Scenargie Simulator, https://www.spacetime-eng.com/en/. ࡛ࡁ࡚࠸ࡿࡇ࡜ࡀࢃ࠿ࡗࡓ㸬 ࡲࡓ㸪୰⥅ඃඛᗘࡢ๭ᙜ㌴୧ྎᩘࢆືⓗ࡟ኚ᭦ࡍࡿࡇ࡜ ࡟ࡼࡾ㸪㏻ಙࢺࣛࣄࢵࢡࡢᵝࠎ࡞ΰ㞧ᗘࡢ≧ែ࡟࠾࠸࡚㧗 ࠸ᣑᩓ⋡ࢆ⥔ᣢ࡛ࡁࡿࡇ࡜ࡀࢃ࠿ࡗࡓ㸬ࡉࡽ࡟஺ᕪ㐨㊰ࡢ ㌴୧࡟୰⥅ඃඛᗘࡢ๭ᙜ࡚ࡿࡇ࡜࡟ࡼࡾ㸪㏻ಙࢺࣛࣄࢵࢡ ࡢΰ㞧᫬࡟ඃඛᗘ๭ᙜྎᩘࡀపୗࡋࡓ㝿࡛ࡶ஺ᕪ㐨㊰ࡢ㌴ ୧ࡀ୰⥅ࡍࡿࡇ࡜࡛ᣑᩓ⋡ࡀྥୖࡍࡿࡇ࡜ࡀࢃ࠿ࡗࡓ㸬 ௒ᚋࡢㄢ㢟࡜ࡋ࡚㸪⥭ᛴᗘࢆᣢࡗࡓ᝟ሗࡢඃඛ㏦ಙไᚚ ࡢᑟධ㸪஺㏻᝟ሗࡢ≉ᚩ࡟ᇶ࡙࠸ࡓ㓄ᕸ⠊ᅖไᚚࡸ㖟ᗙࣔ ࢹࣝ➼ࢆ฼⏝ࡋࡓᐇ⎔ቃ࡟㏆࠸ࢩ࣑࣮ࣗࣞࢩࣙࣥ࡟ࡼࡿ᳨ ドࡀᣲࡆࡽࢀࡿ㸬. ཧ⪃ᩥ⊩ [1]. ᐑᮏ㐍⏕, ᅄ᪉༤அ, 㺚㺊㺖㺼㺞㺼㺷㺓㺳㺎㺻㺟㺰㺖㺼, 㺥㺶㺚㺵㺚㺼㺭㺨㺞㺼㺍㺢㺼, ኱ᒣ ༟, ୕ᾆ 㱟, ᑠⰼ㈆ኵ, CDMA vs. TDMA: Ᏻ඲㐠㌿ᨭ᥼ࡢࡓࡵࡢ㌴㌴㛫㏻ಙࢩࢫࢸ࣒≉ᛶホ౯, 㟁 Ꮚ ᝟ ሗ ㏻ ಙ Ꮫ ఍ ㄽ ᩥ ㄅ , Vol.J93-A, No.7 㸪 pp.474484 ,July 2010. [2]. GokhanKorkmaz, EylemEkici , Fusun O zguner, Umit O zguner: “Urban Multi-Hop Broadcast Protocol for Inter-Vehicle Communication Systems,” in VANET '04 Proceedings of the 1st ACM international workshop on Vehicular ad hoc networks , Pages 7685 , 2004 Chakkaphong Suthaputchakun, Aura Ganz,”Priority Based Inter-Vehicle Communication in Vehicular AdHoc Networks using IEEE 802.11e,” in IEEE Vehicular Technology Conference, 2007. Chakkaphong Suthaputchakun, Zhili Sun, “Priority based Routing Protocol with Reliability Enhancement in Vehicular Ad hoc Network,” in The 2nd International Conference on Communications and Information Technology in 2012 ጧᕒ, ᕝ℩ᝆ,ⱝᒣබጾ, ᒾ⏣ᙲ, ⓑ▼ၿ᫂ , ㌴㌴㛫㏻ಙ࡟࠾ࡅࡿࢥࣜࢪࣙࣥᩘࢆ๐ῶࡍࡿࣇࣛ ࢵࢹ࢕ࣥࢢ᪉ᘧࡢᥦ᱌࡜ホ౯ , ᝟ሗฎ⌮Ꮫ఍◊ ✲ሗ࿌ , 2008(25), 51-57 , 2008-03-07 Brad Williams, Tracy Camp”Comparison of Broadcasting Techniques for Mobile Ad Hoc Networks”, MobiHoc '02 Proceedings of the 3rd ACM international symposium on Mobile ad hoc networking & computing,Pages 194 – 205 Sze-Yao Ni, Yu-Chee Tseng, Yuh-Shyan Chen, and Jang-Ping Sheu ,“The Broadcast Storm Problem in a Mobile Ad Hoc Network,” in MobiCom '99 Proceedings of the 5th annual ACM/IEEE. [3]. [4]. [5]. [6]. [7]. ⓒ 2015 Information Processing Society of Japan. 8.

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