JP3917615B2 - モバイルアドホックネットワーク環境で最適の転送率を探すための調節方法 - Google Patents
モバイルアドホックネットワーク環境で最適の転送率を探すための調節方法 Download PDFInfo
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- JP3917615B2 JP3917615B2 JP2004239938A JP2004239938A JP3917615B2 JP 3917615 B2 JP3917615 B2 JP 3917615B2 JP 2004239938 A JP2004239938 A JP 2004239938A JP 2004239938 A JP2004239938 A JP 2004239938A JP 3917615 B2 JP3917615 B2 JP 3917615B2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/22—Negotiating communication rate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/19—Flow control; Congestion control at layers above the network layer
- H04L47/193—Flow control; Congestion control at layers above the network layer at the transport layer, e.g. TCP related
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/22—Traffic shaping
- H04L47/225—Determination of shaping rate, e.g. using a moving window
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/28—Flow control; Congestion control in relation to timing considerations
- H04L47/283—Flow control; Congestion control in relation to timing considerations in response to processing delays, e.g. caused by jitter or round trip time [RTT]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/29—Flow control; Congestion control using a combination of thresholds
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/021—Traffic management, e.g. flow control or congestion control in wireless networks with changing topologies, e.g. ad-hoc networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0273—Traffic management, e.g. flow control or congestion control adapting protocols for flow control or congestion control to wireless environment, e.g. adapting transmission control protocol [TCP]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/04—Registration at HLR or HSS [Home Subscriber Server]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/06—Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Databases & Information Systems (AREA)
- Mobile Radio Communication Systems (AREA)
- Small-Scale Networks (AREA)
Description
そして、さらに特許文献3および4などがある。
また、ネットワークのパケット遺失はさらに少なくなり、スループットは高い状態を維持するため、既存の方法よりネットワークの資源使用がさらに効率的であり、特にバックグラウンドトラフィックが増加する時も同じ効果を奏する。
図4は、現在スループットと最大スループットとを比較したグラフである。図4に図示されたように、アドホックネットワークでは経時的に最大スループット40が大きく変化することが分かり、現在スループット42との比較を通じてネットワーク状態変化を予測することによってTCP送信側で転送率を調節できる。したがって、現在スループット42を調節する技法が非常に重要であることが分かる。
TCPの送信者はデータを1回に1パケットずつ転送せずにネットワークが耐えられるほどの量だけ転送するが、これはcwndによって調節される。
そして、Diff値が正数であるかどうかを判断した後(S604)、正数である場合は(S604で「はい」)、上限臨界値とその大きさを比較する(S606)。上限臨界値より大きい場合は(S606で「はい」)、現在の転送状態が良好であるということを意味するため、cwndを増加させた後(S608)、base_bwをcur_bwにアップデートする(S610)。Diff値が上限臨界値より大きくない場合には(S606で「いいえ」)、cwndを変化させずに直ちにbase_bwをcur_bwにアップデートする(S610)。
42 現在スループット
Claims (7)
- 転送制御プロトコルで転送率を調節する方法において、
現在転送率(cur_bw)と以前転送率(base_bw)との差値(Diff)を計算する第1段階と、
前記以前転送率の標準偏差(basebw_var)を計算して上限臨界値および下限臨界値を設定する第2段階と、
前記差値と前記上下限臨界値との大きさを比較した結果によって前記以前転送率を前記現在転送率にアップデートする第3段階と、を含むことを特徴とするモバイルアドホックネットワーク環境で最適の転送率を探すための調節方法。 - 前記第3段階は、差値が正数である場合には前記差値を前記上限臨界値とその大きさを比較し、差値が負数である場合には前記差値を前記下限臨界値とその大きさを比較した後、前記以前転送率を前記現在転送率にアップデートする段階であることを特徴とする請求項1ないし3のうちいずれか1項に記載のモバイルアドホックネットワーク環境で最適の転送率を探すための調節方法。
- 前記第3段階は、前記差値が正数でありかつ前記上限臨界値より大きい場合には混雑ウィンドウ値を増加させた後に前記以前転送率を前記現在転送率にアップデートし、前記差値が負数でありつつ前記下限臨界値より大きい場合には混雑ウィンドウ値を変動させずに前記以前転送率を前記現在転送率にアップデートする段階であることを特徴とする請求項4に記載のモバイルアドホックネットワーク環境で最適の転送率を探すための調節方法。
- 前記第3段階は、前記混雑ウィンドウ値が遅い開始臨界値より小さい場合には前記混雑ウィンドウ値を前記遅い開始臨界値に調節する段階を含むことを特徴とする請求項6に記載のモバイルアドホックネットワーク環境で最適の転送率を探すための調節方法。
Applications Claiming Priority (1)
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KR10-2003-0072784A KR100526187B1 (ko) | 2003-10-18 | 2003-10-18 | 모바일 애드 혹 네트워크 환경에서 최적의 전송율을 찾기위한 조절 방법 |
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JP2005124154A JP2005124154A (ja) | 2005-05-12 |
JP3917615B2 true JP3917615B2 (ja) | 2007-05-23 |
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JP2004239938A Expired - Lifetime JP3917615B2 (ja) | 2003-10-18 | 2004-08-19 | モバイルアドホックネットワーク環境で最適の転送率を探すための調節方法 |
Country Status (5)
Country | Link |
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US (1) | US7336608B2 (ja) |
EP (1) | EP1524808B1 (ja) |
JP (1) | JP3917615B2 (ja) |
KR (1) | KR100526187B1 (ja) |
CN (1) | CN100484138C (ja) |
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- 2004-08-19 JP JP2004239938A patent/JP3917615B2/ja not_active Expired - Lifetime
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KR100526187B1 (ko) | 2005-11-03 |
US7336608B2 (en) | 2008-02-26 |
EP1524808B1 (en) | 2012-12-26 |
EP1524808A3 (en) | 2011-10-05 |
EP1524808A2 (en) | 2005-04-20 |
US20050083850A1 (en) | 2005-04-21 |
CN1610352A (zh) | 2005-04-27 |
JP2005124154A (ja) | 2005-05-12 |
KR20050037298A (ko) | 2005-04-21 |
CN100484138C (zh) | 2009-04-29 |
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