Kyung-Joon Park, Kwanhee Jeong, Hyuk Lim, Daeyoung Park
We propose an adaptive carrier sense (CS) scheme with enhanced fairness based on an observation that the conventional adaptive CS mechanism may lead to significant unfairness. Our experimental study with an IEEE 802.15.4 WPAN testbed shows that the proposed algorithm significantly improves fairness compared to the conventional mechanism while providing competitive throughput performance. Copyright # 2011 John Wiley & Sons, Ltd.
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We propose an adaptive flow-level multi-path routing-based traffic engineering solution for an IP backbone network carrying TCP/IP traffic. Incoming TCP flows are switched between two explicitly routed paths, namely the primary and secondary paths (PP and SP), for resilience and potential goodput improvement at the TCP layer. In the proposed architecture, PPs receive a preferential treatment over SPs using differentiated services mechanisms. The reason for this choice is not for service differentiation but for coping with the detrimental knock-on effect stemming from theuse of longer SP that is well known for conventional network load balancing algorithms. Moreover, both paths are congestion-controlled using Explicit Congestion Notification marking at the core and Additive Increase Multiplicative Decrease rate adjustment at the ingress nodes. The delay difference between PP and SP is estimated using two per-egress rate-controlling buffers maintained at the ingress nodes for each path, and this delay difference is used to determine the path over which a new TCP flow will be routed. We perform extensive simulations using ns-2 in order to demonstrate the viability of the proposed distributed adaptive multi-path routing method in terms of per-flow TCP goodput. The proposed solution consistently outperforms the single-path routing policy and provides substantial per-flow goodput gains under poor PP conditions. Moreover, highest goodput improvements under the proposed scheme are achieved by flows that receive the lowest goodputs with single-path routing, while the performance of the flows with high goodputs with single-path routing does not deteriorate with the proposed path switching technique. Copyright # 2011 John Wiley & Sons, Ltd.
针对承载TCP/IP流量的IP骨干网，提出了一种基于自适应流级多路径路由的流量工程解决方案。传入的TCP流在两个显式路由路径之间切换，即主路径和辅助路径(PP和SP)，以提高TCP层的弹性和潜在的性能。在提出的体系结构中，使用差异化服务机制，pp比sp获得优先待遇。选择此选项的原因不是为了服务差异化，而是为了应对由于使用较长的SP(传统网络负载平衡算法中众所周知的SP)而产生的有害连锁效应。此外，这两条路径都使用显式拥塞通知标记作为核心，在入口节点使用加性增加乘性减少率调整来控制拥塞。PP和SP之间的延迟差异是使用在每个路径的入口节点上维护的两个每个出口速率控制缓冲区来估计的，并且该延迟差异用于确定新TCP流路由的路径。我们使用ns-2进行了广泛的模拟，以证明所提出的分布式自适应多路径路由方法在每流TCP good - put方面的可行性。所提出的解决方案始终优于单路径路由策略，并在较差的PP条件下提供可观的每流good - put增益。此外，在提出的方案下，单路径路由下获得最低优卖权的流获得了最大的优卖权改进，而单路径路由下获得高优卖权的流的性能不会因所提出的路径交换技术而下降。版权所有# 2011约翰威利父子有限公司
{"title":"TCP flow aware adaptive path switching in diffserv enabled MPLS networks","authors":"O. Alparslan, N. Akar, Ezhan Karasan","doi":"10.1002/ett.1468","DOIUrl":"https://doi.org/10.1002/ett.1468","url":null,"abstract":"We propose an adaptive flow-level multi-path routing-based traffic engineering solution for an IP backbone network carrying TCP/IP traffic. Incoming TCP flows are switched between two explicitly routed paths, namely the primary and secondary paths (PP and SP), for resilience and potential goodput improvement at the TCP layer. In the proposed architecture, PPs receive a preferential treatment over SPs using differentiated services mechanisms. The reason for this choice is not for service differentiation but for coping with the detrimental knock-on effect stemming from theuse of longer SP that is well known for conventional network load balancing algorithms. Moreover, both paths are congestion-controlled using Explicit Congestion Notification marking at the core and Additive Increase Multiplicative Decrease rate adjustment at the ingress nodes. The delay difference between PP and SP is estimated using two per-egress rate-controlling buffers maintained at the ingress nodes for each path, and this delay difference is used to determine the path over which a new TCP flow will be routed. We perform extensive simulations using ns-2 in order to demonstrate the viability of the proposed distributed adaptive multi-path routing method in terms of per-flow TCP goodput. The proposed solution consistently outperforms the single-path routing policy and provides substantial per-flow goodput gains under poor PP conditions. Moreover, highest goodput improvements under the proposed scheme are achieved by flows that receive the lowest goodputs with single-path routing, while the performance of the flows with high goodputs with single-path routing does not deteriorate with the proposed path switching technique. Copyright # 2011 John Wiley & Sons, Ltd.","PeriodicalId":50473,"journal":{"name":"European Transactions on Telecommunications","volume":"80 1","pages":"185-199"},"PeriodicalIF":0.0,"publicationDate":"2011-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86832341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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