Many applications in modern science need to transmit extremely massive amount of data over wide area networks. These data usually do not need stringent real-time requirements but require large bandwidth to finish transmission with unreasonable time. High-energy physics experiments and climate modeling and analysis are typical examples of such applications. As TCP is known to perform inefficiently over networks of large delay-bandwidth product, efficient transmission of this kind of massive, non-real-time data has been heavily studied in the past. The previous results work well in dedicated networks but will compete for fair share of bandwidth with normal TCP connections if they operate in the public networks. The objective of this thesis is to design a new transmission protocol for the above applications that can operate in the public networks without affecting normal TCP connections. The new protocol is called Rate Control Transmission Protocol (RCTP). The idea is to apply the packet-pair measurement technique to measure the bandwidth share in the network for the transmission. The sending rate is based on that measurement and is precisely compensated by the RTT variance measurement. Due to the RTT compensation, RCTP can efficiently utilize the unused bandwidth in the network while not affecting the normal TCP transmissions, making it perfect for transmitting massive, non-real-time data in the public networks.

在電信獨占市場的時代，語音及訊務都架設在TDM (時間分割多工)的系統上，其客戶服務比新世代網路系統較為簡易。1997年，政府開放行動電話營運執照申請，在2008年第一季末，手機門號(包含2G+PHS+3G)幾乎與人口(2300萬戶)ㄧ樣多。2000年，政府開放固網執照申請，因為固網路鋪設到last-mile的速度緩慢及成本較高，「新進業者」(CLEC)比「既有經營者」(ILEC)較不具備競爭力，加上無killer application (殺手級應用)及差異性的客服，因此至今CLEC沒有爭取到太多的顧客，一直到Skype進入台灣，大家才看到電信語音市場另一塊新版圖。 近年來VoIP (Voice Over IP)技術進步，將通訊協定信號(SIP)與媒體語音訊務(RTP/RTCP)分開處理。因此，全世界各通信製造業者及服務商(SP)開始運用此技術在行動電話多媒體服務及IP多媒體子系統(IMS)的架構上。不僅如此，有很多網路用戶與互聯網企業也因為開始分享資訊，造成一些新興內容產業--(UGC用戶產生內容、SNS社會網絡服務) 的誕生。所以預料在新世代電信網路(NGN)新科技的環境之下，將會有不少新興產業如海星組織一般的誕生、滋長及蔓延，這對電信業者、服務供應商及用戶將會帶來更多維護及服務的衝擊。 因此本研究將參考現有電信客戶服務跟未來20年通信技術，建議如何使用混合式(集權/分權)的客戶服務來協助電信級固網業者及服務開發者去創造企業價值、突破現有困境、達到永續經營的目的，以因應未來電信自由化及新電信技術。 / In the monopoly era, the telecom network was implemented on TDM (Time Division Multiplexer) system, whose customer service of voice call is comparatively simpler and easier than NGN (Next Generation Network) system. In 1997, government opened the application of mobile network operation license. By end of 1Q of 2008, the subscriber count (includes 2G, PHS and 3G) of mobile network was almost as many as population (23 millions). In the year of 2000, government opened the application of fixed network operation license. Because of the slower speed and higher cost of last-mile network implementation, up to now, new Competitive Local Exchange Carriers (CLEC) were less competitive than Incumbent Local Exchange Carrier (ILEC). Plus, not having the killer-application and the differentiated customer services, CLECs did not have too many subscribers in these years. Until Skype was introduced to Taiwan, all of us, then, saw the other new territory of voice telecom market. These years, VoIP (Voice over IP) technology was improved to have communication protocol (SIP Session Initialization Protocol) and voice traffic (RTP/RTCP Real-time Transport Protocol/Real-time Transport Control Protocol) been handled separately; i.e., the development of voice application software and debug became easier. Thus, the world-wide telecom manufacturers and service providers started to use this technology on the architecture of mobile voice multimedia service and IP Multi-media Subsystem (IMS). Even amount of network users were sharing information with enterprises who owned inter-connection network, and created the new content businesses (UGC User Generated Content, SNS Social Network Services). Therefore, under the new technology environment of NGN, we foresee some new businesses will be created, then, growing and expanding like the starfish organization. For telecom operators, service providers and users, this will bring some more new impacts of maintenance and service. Therefore, this study will refer the existing telecom customer service and the telecom technologies may have in next coming 20 years to propose how to use the hybrid (centralized/de-centralized) customer service to help both carrier-grade fixed network operators and service developers to create business value, break through current dilemma to reach business continuity goal in response to the telecom liberalization and new telecom technologies.