Traffic-based reconfiguration for logical topologies in large-scale WDM optical networks
スポンサーリンク
概要
- 論文の詳細を見る
Wavelength-division multiplexing (WDM) technology has emerged as a promising technology for backbone networks. The optical layer based on WDM technology provides optical routing services to the upper layers such as the packet-switching layer and the time-division multiplexing (TDM) layer over the generalized multiprotocol label-switching (GMPLS) paradigm. The set of all-optical communication channels (lightpaths) in the optical layer defines the logical topology for the upper layer applications. Since the traffic demand of upper layer applications fluctuates from time to time, it is required to reconfigure the underlying logical topology in the optical layer accordingly. However, the reconfiguration for the logical topology is reluctantly disruptive to the network since some lightpaths should be torn down and some traffic has to be buffered or rerouted during the reconfiguration process. Therefore, it needs to have an efficient transition method to shift the current logical topology to the new one so as to minimize the effect of the reconfiguration on the upper layer traffic. This paper proposes several heuristic algorithms that move the current logical topology efficiently to the given target logical topology in large-scale wavelength-routed optical networks. In the proposed algorithms, the performance improvement/degradation of data transmission [transmission delay or distance between a source-destination (s-d) pair] caused by a new lightpath is considered as benefit for establishing the new lightpath. The proposed algorithms construct the new logical topology starting from a lightpath with the largest benefit to the user traffic. Simulation experiments have been performed to evaluate the proposed algorithms in comparison with existing algorithms in a National Science Foundation Network (NSFNET)-like network model with 16 nodes and 25 links. The results show that the proposed algorithms yield much better performance (shorter average packet hot distance) than previous algorithms mostly with comparable computation time.
論文 | ランダム
- 首長と職員で進める行政経営改革 最適行政経営の実例(32)千葉県浦安市(上)市民との協働を重視する「浦安市自治体経営モデル」の構築
- 首長登壇 未来に誇れる合志市づくり--「健康都市こうし」の創造
- 首長インタビュー(34)未来への地方自治--頼高英雄さん(埼玉県蕨市長)
- 私の目標はダイヤモンドの原石を磨き上げ、一騎当千の人材を育てること (特集 人財を育てる--自治体は本気で人を育ててきたのか) -- (首長に聞く--人材育成のポリシー)
- 首長に聞く--人材育成のポリシー (特集 人財を育てる--自治体は本気で人を育ててきたのか)