| 講演抄録/キーワード |
| 講演名 |
2009-11-12 09:30
QoSオーバレイネットワーク構成法とその評価 ○川原亮一・亀井 聡・上山憲昭・長谷川治久・吉野秀明(NTT)・Eng Keong Lua(Carnegie Mellon Univ.)・中尾彰宏(東大) CQ2009-41 |
| 抄録 |
(和) |
IP レイヤを変更せずにend-to-end QoS を向上させる技術として,オーバレイネットワークによるルーチング制御が注目されている.最適な経路を探索するにはフルメッシュオーバレイトポロジ上での全経路探索を要するが品質測定コストや経路計算コストの問題が生じる.そこで,これらコストを削減しつつ全経路探索時とほぼ同等のQoS 向上を実現するオーバレイネットワーク構成法について述べる.提案手法は,少数のオーバレイノードが多くの通信ペアに対し最適経路を提供可能であるという実データ分析結果に基づく.上位・下位の2 階層とし,上位層に上述の少数のノードを配置し,上位層内および上位-下位層のノード間にのみ,オーバレイリンクを張る.そうすることで品質測定・経路計算コストを削減しつつ全経路探索時とほぼ同等のQoS 向上を実現する.また,PlanetLab データを用いてその有効性を示す. |
| (英) |
It is known that there exist Triangle Inequality Violations (TIVs) with respect to network Quality of Service (QoS)
metrics such as latency between nodes in the Internet. This motivates the exploitation of QoS-aware routing overlays. To
find an optimal overlay route, we would usually need to examine all the possible overlay routes. However, this requires both
measuring QoS between all node pairs and investigating all the routes in the full-mesh overlay topology, which poses scalability
problem in terms of both measurement cost and route calculation and dissemination cost. We thus propose a method of
constructing a QoS overlay network that enables us to find a near optimal route in a cost-effective manner. Our idea is based
on the finding that a small number of overlay nodes can provide the optimal routes for a large number of node pairs, which
is obtained through measurement data analysis between PlanetLab nodes. Our overlay network has two layers where the upper-
layer consists of such small number of overlay nodes that can provide the optimal routes while the lower-layer consists of
the other overlay nodes. By allocating such overlay nodes at the upper-layer, we can provide better QoS routes for each node
pair with high probability. We construct the overlay network topology where the upper-layer overlay nodes are connected in
full-mesh manner while the lower-layer overlay nodes are not connected in full-mesh but only to upper-layer nodes. Through
this structure, we can reduce measurement and route calculation costs. Using PlanetLab data, we show that our method can
achieve almost the same performance as the optimal solution. |
| キーワード |
(和) |
オーバレイネットワーク / QoS / 経路制御 / / / / / |
| (英) |
overlay network / QoS / routing / / / / / |
| 文献情報 |
信学技報, vol. 109, no. 274, CQ2009-41, pp. 15-20, 2009年11月. |
| 資料番号 |
CQ2009-41 |
| 発行日 |
2009-11-05 (CQ) |
| ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
| PDFダウンロード |
CQ2009-41 |