On the impact of congestion control for Concurrent Multipath Transfer on the transport layer
On the impact of congestion control for Concurrent Multipath Transfer on the transport layer
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2011-06
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通讯作者：
Thomas Dreibholz;M. Becke;Hakim Adhari;E. Rathgeb
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作者：
Thomas Dreibholz;M. Becke;Hakim Adhari;E. Rathgeb
由于越来越多的关键Internet服务（如紧急呼叫处理或电子商务交易）的弹性需求，多家庭网络站点的部署变得越来越普遍。拥有多条互联网访问路径，同时利用它们以通过所谓的并发多路径传输（CMT）来提高有效负载吞吐量似乎很简单。目前，两个重要的互联网传输层协议的CMT扩展——用于TCP的多路径TCP （MPTCP）和用于SCTP的CMT-SCTP——是IETF标准化的重点。目前在IETF上下文中讨论得非常活跃的一个挑战是这些CMT协议的拥塞控制。基于资源池（RP）的思想，IETF目前讨论了两种方法：我们自己的CMT/RP方法用于CMT- sctp和MPTCP拥塞控制方法用于MPTCP。这两种方法都只进行了粗略的测试——主要是在类似的路径设置中，即使用“他们的”协议，具有几乎相同的QoS特征的路径。因此，本文的目的是比较现有的方法。特别是，我们还分析了包含不同路径的更具挑战性的场景，即具有不同特征的路径。我们的目标是提供对不同方法的洞察，以支持IETF在CMT.123上的标准化活动
Due to the resilience requirements of a steadily growing number of critical Internet services (like emergency call handling or e-commerce transactions), the deployment of multi-homed network sites becomes more and more common. Having multiple Internet access paths, it seems straightforward to utilise them simultaneously in order to improve payload throughput by so-called Concurrent Multipath Transfer (CMT). Currently, CMT extensions for the two important Internet Transport Layer protocols — Multipath-TCP (MPTCP) for TCP and CMT-SCTP for SCTP — are in the focus of IETF standardisation. A challenge — which is currently very actively discussed in the IETF context — is congestion control for these CMT protocols. Based on the idea of Resource Pooling (RP), two approaches are currently discussed in the IETF: our own approach CMT/RP for CMT-SCTP as well as the MPTCP congestion control for MPTCP. Both approaches only have been roughly tested yet — mostly in similar path setups, i.e. paths having almost the same QoS characteristics, using “their” protocol. Therefore, the goal of this paper is to compare the existing approaches. Particularly, we also analyse more challenging scenarios containing dissimilar paths, i.e. paths having differing characteristics. Our goal is to provide insight into the different approaches, to support the IETF standardisation activities on CMT.123