• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권7호
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• pp.2354-2370
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• 2015

The advantages of employing SCTP-based Concurrent Multipath Transfer (CMT) have been demonstrated to be very useful for data delivery over multi-homed wireless networks. However, there is still significant ongoing work addressing some remaining limitations and challenges. The most important concern when applying CMT to data delivery is related to handling packet reordering and buffer blocking. Another concern on this topic is that current sender-based CMT solutions seldom consider balancing the overhead and sharing the load between the sender and receiver. This paper proposes a novel Receiver-driven Cooperation-based Concurrent Multipath Transfer solution (CMT-Rev) with the following aims: (i) to balance overhead and share load between the sender and receiver, by moving some functions including congestion and flow control from the sender onto receiver; (ii) to mitigate the data reordering and buffer blocking problems, by using an adaptive receiver-cooperative path aggregation model, (iii) to adaptively transmit packets over multiple paths according to their receiver-inspired sending rate values, by employing a new receiver-aware data distribution scheduler. Simulation results show that CMT-Rev outperforms the existing CMT solutions in terms of data delivery performance.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권4호
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• pp.1406-1423
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• 2014

Multi-mode device which combines multiple access technologies into a device will offer more cost-effective solution than a sole access implementation. Its concurrent multipath transfer (CMT) technology can transmit media flows over multiple end-to-end paths simultaneously, which is essential to select at least two paths from all available paths. At real networks, different paths are likely to overlap each other and even share bottleneck, which can weaken the path diversity gained through CMT. Spurred by this observation, it is necessary to select multiple independent paths as much as possible to avoid underlying shared bottleneck between topologically joint paths. Recent research in this context has shown that different paths with shared bottleneck can weaken the path diversity gained through CMT. In our earlier work, a grouping-based multipath selection (GMS) mechanism is introduced and developed. However, how to estimating the selection is still to be resolved. In this paper, we firstly introduce a Selection Correctness Index (SCI) to evaluate the correctness of selection results in actual CMT experiment. Therefore, this metric is helpful to discuss and validate the accuracy of the output paths. From extensive experiments with a realized prototype, the proposed scheme provides better evaluation tool and criterion in various network conditions.

• Journal of Communications and Networks
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• 제12권3호
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• pp.275-284
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• 2010

The current multihome-aware protocols (like stream control transmission protocol (SCTP) or parallel TCP for concurrent multipath data transfer (CMT) are not designed for high-capacity and large-latency networks; they often have performance problems transferring large data files over shared long-distance wide area networks. It has been shown that SCTP-CMT is more sensitive to receive buffer (rbuf) constraints, and this rbuf-blocking problem causes considerable throughput loss when multiple paths are used simultaneously. In this research paper, we demonstrate the weakness of SCTP-CMT rbuf constraints, and we then identify that rbuf-blocking problem in SCTP multihoming is mostly due to its loss-based nature for detecting network congestion. We present a simulation-based performance comparison of FAST TCP versus SCTP in high-speed networks for solving a number of throughput issues. This work proposes an end-to-end transport layer protocol (i.e., FAST TCP multihoming as a reliable, delaybased, multihome-aware, and selective ACK-based transport protocol), which can transfer data between a multihomed source and destination hosts through multiple paths simultaneously. Through extensive ns-2 simulations, we show that FAST TCP multihoming achieves the desired goals under a variety of network conditions. The experimental results and survey presented in this research also provide an insight on design decisions for the future high-speed multihomed transport layer protocols.

• 한국통신학회논문지
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• 제37B권11호
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• pp.975-983
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• 2012

하나의 단말이 WiFi, 3G, LTE 등 다양한 통신 인터페이스들을 가지고 있는 것이 점점 일반화 되면서, 단말간의 통신에서 다수의 네트워크 경로를 동시에 이용하여 전숑 효율을 높이고자 하는 연구들이 진행되고 있다. MPTCP는 IETF에서 표준화가 진행되고 있는 transport layer protocol로서 서로 다른 IP 주소를 가지고 있는 여러 통신 인터페이스를 동시에 사용한 데이터 전송을 가능하게 한다. 하지만 현재의 MPTCP는 서로 다른 성질의 네트워크의 인터페이스를 동시에 사용하면 reordering 문제로 오히려 하나의 네트워크를 사용하는 것보다 성능이 저하되는 문제점을 가지고 있다. 따라서 본 논문은 MPTCP에서 통신 인터페이스의 네트워크 상태에 따른 패킷 스케줄링 방법과 수신단 기반의 패킷 손실 복구 방법을 제안함으로써 MPTCP에서 reordering 문제로 발생하는 성능 저하를 감소시켰다. 또한 제안된 방법은 기존의 방법보다 더 나은 throughput과 더 빠른 재전송을 수행 할 수 있음을 시뮬레이션을 통해 확인하였다.