欢迎进入网络技术社区论坛,与200万技术人员互动交流 >>进入 WiMAX技术首次在美国大规模应用刚刚过去一年时间。我们正在考察随后发现的情况。 IEEE(电气电子工程师学会)预计在今年夏季最后批准802.16m标准(也称作WiMAX 2)。目前在美国提供商业性WiMAX服务的
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WiMAX技术首次在美国大规模应用刚刚过去一年时间。我们正在考察随后发现的情况。
IEEE(电气电子工程师学会)预计在今年夏季最后批准802.16m标准(也称作WiMAX 2)。目前在美国提供商业性WiMAX服务的最大的互联网服务提供商Clearwire称,它计划在明年的某个时候测试802.16m技术并且希望在2012年部署这个技术。
那么,我们对于这个WiMAX的后续情况都知道些什么呢?我们知道,它将向下兼容美国运营商目前正在使用的WiMAX标准802.16e。这就意味着当Clearwire升级到新的标准的时候,它将能够以相对低的成本和极小的中断进行升级。
我们还知道802.16m的速度要比它以前的标准快得多。WiMAX论坛副总裁Mohammad Shakouri说,新的WiMAX标准的目标是向用户提供超过每秒100MB的平均下载速度。相比之下,Sprint在2008年商业性推出的最初的Xohm WiMAX服务的下载速度是每秒3.7至5MB。
Shakouri说,802.16m标准通过结合使用智能天线技术和多信道方法提供更快的速度。他在解释802.16m如何使用多信道提供数据时说,你可以把它想象为你在建设一个20个车道的高速公路。虽然在同一条高速公路上建设20个车道是很复杂的,但是,你可以使用2个10车道公路或者4个5车道公路。通过把多个信道结合起来,你就可以得到更高的速率。
Shakouri说,虽然新的WiMAX标准极大地提高了这个技术的速度,但是,它的覆盖范围没有比当前的WiMAX技术进一步扩大。目前的WiMAX技术的每个接入点的覆盖范围是31平方英里。他解释说,802.16m的重点是如何为目前同样数量的用户提供更大容量的数据速率。
WiMAX论坛目前正在为开发人员制定802.16m认证模型,希望在IEEE今年9月批准这个标准的时候能够让这个技术开始应用。Shakouri说,如果一切按计划进行,我们将在一年之后开始看到WiMAX 2设备上市。
Shakouri说,802.16e标准也曾发生过同样的事情。这个标准也是在批准一年之后才推出采用这个标准的设备。因此,大多数业内人士认为你就能够在2011年下半年得到这种网络设备。

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Yes,youcansearchinsideaBLOBinMySQLusingspecifictechniques.1)ConverttheBLOBtoaUTF-8stringwithCONVERTfunctionandsearchusingLIKE.2)ForcompressedBLOBs,useUNCOMPRESSbeforeconversion.3)Considerperformanceimpactsanddataencoding.4)Forcomplexdata,externalproc


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