This paper presents a simulation study of Notification (BECb0 scheme [15] are two examples of reactive TCP performance over congested ATM local area networks, rate-based schemes. In the FECN scheme, a cell is marked at We simulated a variety of schemes for congestion control for the point of congestion and then forwarded to its destination as ATM LANs, including a simple cell-drop, a credit-based flow usual. After receiving the marked cell, the destination node control scheme that back-pressures individual VC's, and two send an explicit congestion notification to the source to selective cell-drop schemes. Our simulation results for throttle back its transmission rate. The BECN scheme differs congested ATM LANs show the following: (1) TCP from the FECN scheme in that congestion notifications are performance is poor under simple cell-drop, (2) the selective sent directly back to the source by the switch experiencing cell-drop schemes increase effective link utilization and result congestion. Both the BECN and FEC'N schemes can achieve a in higher TCP throughputs than the simple cell-drop scheme, low cell-loss rate by provisioning sufficient buffers. There are and (3) the credit-based flow control scheme eliminates cell also two proposed credit-based link-by-link flow control loss and achieves maximum performance and effective link schemes, the AN2 flow control [18] and the Flow-Controlled utilization. Virtual Channels (FCVC) [121 scheme. These two schemes are based on virtual-circuits (VC) and require per-VC buffering. IASiil OISTRIBtJTION OF THIS DOOUMEN'F IS UNLIMITED DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
Shenzhen is a lengendary city booming out from a small fishing village within ten years. It is situated at the south end of China, along eastern side of the Pearl River opening to the South China Sea. As one of the earliest of four Special Economic Zones in China since 198 1, Shenzhen has enjoyed a set of privileged economic policies and turned into an energetic metropolis with population of over three million. According to the strategic planning, Shenzhen will expand to an area of nearly 2000 square kilometers from 300 square kilometers right now. The local government seeks to realize 100% urbanization in Shenzhen in a short time. In other words, the whole outskirts and rural area will be urbanized. In the conprehensive plannning, the surburb, formerly Baoan county, is becoming another two districts (Baoan and Longgang) besides the existing three districts (Luohu, Futian, and Nanshan). The grouped structure of urban layout in the planning attempts to organize the present villages and towns in the outskii into 8 groups (4 in each district), which are assigned different priority urban bctions such as transportation, communication, industry, tourism, district centre, etc. Generalization of the project of Longgang District Planning Our project is concerned with the zone planning ofthe central group in Longgang district. It consists of Longgang, Pingdi, and Pingdi Centre, covers an area of over 180 square kilometers, and holds population of 200,000. According to the strategic plan, the group is to develop into the future admistrative, commercial, and cultural center of Longgang district. The study of urban design is one important field in our project.
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