| Future Internet will be a heterogeneous network environment which forms of access such as GPRS,3G, WiFi, WiMax, etc., which has the cognitive ability for wireless environment, network environment and user environment in order to provide users with smart and cooperation, fair and friendly serivces. Internet resources can be categorized into two types, which are content resource that can be recognized as the content of a specific service (e.g., video, voice, etc.), and transmission service that devotes to provide user with transmission capacities (e.g., bandwidth, delay, jitter, etc.). With the development of mobile communication technology and the integration of mobile communications and Internet technology, the content-rich multimedia streaming will be the most attractive content services in the future Internet. Furthermore, wireless consumer electronics devices have multiple network interfaces and multiple heterogeneous access capability at the same time, they can increase their throughput by making use of parallel transmissions over multiple paths and bandwidth aggregation. However, current congetion window-based multipath transport protocol cannot satisfy the smart cooperation and friendliness requirements of furture Internet.Motivated by the fact that the design of smart services-oriented cognitive transmission control protocol will be an urgent need in the future wireless network, this paper focuses on the convergence of multi-interface technology and wireless communication technology, and is intended to unfold cutting-edge work in the data transmission field in the new Internet system of the future. With the core content service and streaming media service in the future Internet as the cognition driving source, and with the smart transmission service as the main objective, this paper performed in-depth analysis and studies on the key technology of the multi-path transmission mechanism. This paper summarizes the key scientific issues in the current multi-path transmission mechanism, explores new theories and new methods of smart transmission service that will meet users’needs in the future streaming media environment, and proposes helpful ideas for the ultimate realization of smart, efficient data transmission service for users in the future smart, collaborative Internet. The main contents of this paper include the following aspects:(1) This paper examined the performance of Concurrent Multipath Transfer (CMT) in terms of throughput, end-to-end packet delay by considering reasonable background traffic. This paper discussed how the presence of background traffic affects the performance of CMT in detail, which is generally ignored by most current researchers. Based on above work, this paper proposed an improved retransmission algorithm by jointly considering the localness nature of background traffic and paths’ comprehensive characteristics during selecting retransmission destination. Finally, a loss-aware fast retransmission trigger is introduced for efficient loss recovery. This part provides a foundation for subsequent studies on multi-path and friendly transmission, and also provides basis for the establishment of of heterogeneous multi-homed network simulation environment for subsequent studies.(2) In order to improve the data delivery performance and users’ quality of experience (QoE) for multimedia streaming service while still remaining fair to the competing TCP flows, this paper proposed a novel TCP-friendly Stream Control Transmission Protocol (SCTP)-based CMT solution necessitating the following aims:(i) fairness to TCP flows,(ⅱ) load sharing, and (ⅲ) improve multimedia delivery performance,(ⅳ) introduce a proposal for saving energy. The proposed solutioin provides a reference for the research and design of the future environment-friendly multipath transmission mechanism and for the wide application of the parallel multi-path transmission mechanism in the future Internet.(3) This paper designed a novel cross-layer cognitive SCTP for efficient multimedia data delivery by jointly considering the characteristics of MAC layer and transport layer. A cross-layer path switching trigger is designed to improve the efficiency of the path switching mechanism and further provide an optimal congestion window (cwnd) fast recovery scheme after path switching. A congestion-aware multimedia data distributor is introduced to overcome a "hot-potato" congestion problem and enable an optimal transmission behavior by identifying network congestion. This part lays a foundation for the design of the subsequent smart service-oriented cross-layer optimized transmission control mechanism.(4) Asymmetric paths with disparate characteristics will undoubtedly result in out-of-order packets received and buffered in constrained receiver buffer. If CMT only utilizes all available paths for data delivery, it will undoubtedly degrade application-level performance since asymmetic paths may be with large quality differences. This paper proposes a novel multiple-QoS-aware bandwidth aggregation solution for CMT (dubbed as CMT-CQA). The goals of CMT-CQA are:(i) to offer CMT a MAC-SCTP cross-layer path selection mechanism,(ⅱ) to provide CMT with an intelligent "Full CMT-to-Partial CMT" adjustment strategy according to the real-time changing multipath conditions,(ⅲ) to introduce a proper multimedia transmission behavior to improve users’QoE for multimedia streaming service.(5) Current SCTP solutions seldom consider balancing the overhead and sharing the load between the sender and receiver. As a remedy, this paper proposed a novel receiver-driven SCTP-based multimedia delivery solution which runs some important functions at receiver including:(ⅰ) appropriate sending rate estimation and advertisement, supported by a designed receiver-based sending rate estimator;(ⅱ) primary path selection and fast recovery, enabled by a developed receiver-assisted path switch trigger; and (ⅲ) improve the transmission performance and quality of service in multi-homed SCTP-based wireless networks. The proposed solution provides a helpful idea for the establishment of a smart, multi-node collaborative transmission mechanism in the future Internet. |
PDF Full Text Request