le Network Technologies (SNT)將推出一款針對公共和軍事網(wǎng)絡(luò)下一代無線技術(shù)的可升級虛擬和仿真軟件環(huán)境。基于由國防先進技術(shù)研究計劃署(DARPA)所開發(fā)的全球移動信息系統(tǒng)(GloMo)模擬程序,SNT所推出的QualNet和Exata仿真軟件可以精確地分別模擬3G和4G移動通信網(wǎng)絡(luò)的行為和操作,包括服務(wù)質(zhì)量、軟件定義無線電和網(wǎng)絡(luò)中心服務(wù)(network-centric services)。
通過提高無線、移動網(wǎng)絡(luò)中心服務(wù)的可預(yù)測性,QualNet和Exata旨在幫助研發(fā)人員對新的網(wǎng)絡(luò)拓撲進行仿真和分析,在開始動工架設(shè)昂貴的硬件公共設(shè)施之前對其進行實驗驗證。
QualNet和 Exata將設(shè)計、可視化和分析軟件工具包集成在了一個能同時對上千個元器件進行建模的實時仿真環(huán)境中。通過采用并行處理架構(gòu),只要添加幾個核來執(zhí)行其代碼就可將軟件仿真升級。QualNet和Exata沒有采用不準(zhǔn)確的抽像,而是直接虛擬網(wǎng)絡(luò)和各個分層,從機械層、媒體訪問控制(MAC)、鏈路層、網(wǎng)絡(luò)層、網(wǎng)絡(luò)協(xié)議層、傳輸層到用戶應(yīng)用程序,如Email、VoIP、網(wǎng)頁瀏覽和視頻服務(wù)器。
據(jù)SNT稱,用戶通過仿真軟件所得的仿真結(jié)果與網(wǎng)絡(luò)實際運行的情況相同,并且響應(yīng)時間也相同。通過采用開放標(biāo)準(zhǔn)端口,QualNet和Exata還可以精確地重現(xiàn)信道環(huán)境的影響,包括器件行為、通信鏈路、發(fā)射器/天線、地形和大氣影響以及人為因素。
QualNet現(xiàn)已面市。Exata將在2008年第四季度推出支持Unix、 Windows、Mac OS X和Linux操作系統(tǒng)下并行處理環(huán)境和排序處理環(huán)境的版本。
翻頁查看英文原文:
What if software could simulate wireless nets?
A scalable emulation and simulation software environment for next-generation wireless technologies aimed at both civilian and military networks will be announced today by Scalable Network Technologies Inc. (Los Angeles). Building on the Global Mobile Information Systems (GloMo) Program simulator developed by the Defense Advanced Research Projects Agency (Darpa), Scalable Network Technologies' QualNet and Exata software simulators accurately model the behavior and operations, respectively, of mobile communications networks, including quality-of-service, software defined radios and network-centric services.
By improving the predictability of wireless, mobile net-centric services, QualNet and Exata seek to enable developers to "what if" new network topologies and then try them out before building expensive hardware infrastructures.
QualNet and Exata integrate design, visualization and analysis software toolsets into a real-time simulation environment capable of modeling thousands of devices in simultaneous use. A parallel processing architecture enables the software simulators to be scaled up by merely adding more cores to execute its code. Rather than using inaccurate abstractions, QualNet and Exata directly emulate networks and the hierarchy of layers, from the physical layer, Media Access Control (MAC), link layer, network layer, Internet protocol (IP) layer, transport layer and user applications, such as Email, VoIP, web browsing and video servers.
Scalable Network Technologies claims that users interacting with the software simulator get the same responses as they do from real networks, and with the same response times. Using open standard interfaces, QualNet and Exata also accurately recreate channel environment effects, including device behaviors, communication links, transmitters/antennas, terrain and atmospheric effects, and human interactions.
QualNet is available now, and Exata will be available in the fourth quarter of 2008 on both sequential and parallel processing environments running Unix, Windows, Mac OS X and Linux operating systems.
