等待移动WiMAX

太多缺少的细节将此无线宽带技术置于等待和见类别。

关于宽带无线技术的供应商和运营商的嗡嗡声是升温的,由新的芯片组和无线电产品加热,并被一些巨大的运营商投资拟合。

For example, Clearwire in the summer rounded up $900 million, including $600 million from WiMAX zealot英特尔, to upgrade its growing wireless broadband net to support the IEEE's 802.16e mobile WiMAX standard.

And短跑nextel.8月份成为第一个美国蜂窝提供商宣布在许可2.5GHz频段中部署全国移动WiMAX网的计划。

Sprint战略规划总监Peter Cancistr表示,该公司将于明年开始提供移动WiMAX服务。

英特尔表示计划将移动WiMAX芯片组纳入其Centrinowirelesspackage, which today supports only无线上网connections. The WiMAX addition is expected in 2007 and would enable WiMAX to be embedded in laptops and other clients, as Wi-Fi connectivity is today.

对于企业,移动WiMAX承诺支持多媒体应用和协作。

但尽管最新的进展情况,但企业不会感到几个月的影响和重要性,如果不是多年。

WiMax口味

So far, the limited U.S. deployments of WiMAX have been for the fixed version of the underlying IEEE standard 802.16d, mainly as carrier or wireless provider backhaul or Internet access services. With fixed WiMAX, stationary users link to a base station through a companion radio mounted outside a house or business, as an alternative to DSL or cable Internet access.

2005年底批准的802.16e标准迈出了WiMax。一旦笔记本电脑,平板电脑和PDA都配备了移动WiMAX卡,他们将能够创建并保持一个16E基站的多重链接,同时在运动中或在汽车中乘车或汽车。下行链路速度将是4Mbps,芯片供应商说,2Mbps上行链路,3到5英里之间的范围,范围为3英里。与10到15英里的吞吐量有10到15英里,并将Wimax的良好网站与基站的良好线路相比。

但是缺少了现实世界的数据,显示了这些移动WiMAX统计数据。例如,Sprint不会在过去12个月内与其合作伙伴英特尔进行的现场测试的详细信息,摩托罗拉和三星。和技术和定价令人担忧比比皆是。

因此,许多企业用户暂时地搁置了移动WiMAX的考虑。一个例子是德克萨斯州奥斯汀市。Cio Peter Collins表示,他认为移动宽带的潜力在警察巡洋舰中支持视频流来的视频流到发货人员。固定WiMAX与固定相机也可以,“但一旦开始移动巡逻车,它就不起作用,”他说。

"I'm going to be more than willing to take a look at [mobile WiMAX]," Collins says, once he has proof that the mobile connectivity works and can see what kind of performance it delivers under load.

尽管运营商和供应商活动增加了,但柯林斯可能有一段时间等待。

对于一个,通过IEEE的常规勘误流程来纠正标准中的错误,不一致和歧义,遭到广泛的重新加工。Earceng Phillips,Airtegrity Wireless,宽带设备制造商和.16E委员会成员的Greg Phillips表示,该勘测工作令人侧重于兼容性和互操作性.16E委员会的宽带设备制造商和成员。

WiMAX谨慎

此外还有问题是.16E的移动性要求将影响在无线连接上可转移多少数据。最初,IEEE估计移动WiMAX将从固定WiMAX提供15%至20%的带宽。“但是现在,我们看到的35%到35%的带宽可用,”Phillips说。

如果不知道带宽移动WiMAX将提供多少,企业网络高管都会难以评估该技术是否优于诸如Wi-Fi和完善的蜂窝网等产品的产品要求码头多个访问EV-DO修订A. Sprint将于2007年开始提供Rev A服务,平均下载速率为450k至800kbps,平均上行链路范围为300k至400kbps。虽然这些费率是来自兆比克WiMAX服务的远远哭泣,但它们可能是现有的企业移动性要求。目前,这些通常呼叫电子邮件,有时是附件,或访问库存和客户数据的有限子集。

"We're early enough in the [mobile WiMAX] market so that the enterprise isn't sure what it wants," says Tom Jazny, a vice president for Samsung Telecommunications America, which will be a mobile WiMAX supplier to Sprint. "Mobile WiMAX is capable of delivering voice, data and video, but it's not clear [yet] what the carriers will lead with."

也缺乏availabil信息设备ity and services costs, as well as security. On the latter, the history of Wi-Fi security problems is likely to make enterprise network executives wary regarding mobile WiMAX. While the WiMAX standard does include security, and WiMAX will run in licensed and less-open spectrum than Wi-Fi, before buying into the buzz, enterprise users will want to know exactly what equipment vendors and carriers are doing to protect the mobile WiMAX network.


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