由于城市的发展，市区面积的增加，需要考虑信息覆盖的扩容问题。要覆盖城市扩建的区域，我们需要增加AP数量，本文提出3种解决的备选方案：增加新设备，更换新设备，增加老设备。将扩容后需要信号覆盖的区域减去已有信号覆盖的区域，即得到需要通过扩容来进行信号覆盖的区域。对该区域可用优化选址方法进行基站的优化选址。另外，考虑到已有设备的更新可提高设备的信号覆盖范围，因此我们在优化选址方法的应用中，结合老设备和新设备的3种组合情况，应用组合优化方法更好的解决信息覆盖的扩容问题。获得以下的结论:1 3种方案新增成本：增加新设备﹤增加老设备﹤更换新设备2 更换新设备是效益最好的方案，增加新设备是时效性最好的方案3 给出了获得优化扩容决策的免疫遗传法算法。
关键词： AP设备;扩容；选址；成本；覆盖
Optimize expansion of information overlay
Abstract：Due to the development of the city, urban area is increasing, expansion of information overlay need take into consideration, in order to overlay the insreased areas, we need to add AP quantity, this paper puts forward three solutions: add new facilities; add old facilities; replace with new facilities.
The expanded areas that need signal coverage minus those areas that signal overlayed already is the areas, which need expand the signals. Apply optimize site testing to the area to get the base station site. In addition, considering the existing equipment update can improve equipment signal coverage, so in the application of optimal siting method we need consider old equipment and new equipment combinatorial optimize problem. Get follow conclusion:
1 The addition cost of 3 kind solutins: add new facilities﹤add old facilities﹤replace with new facilities.
2 The solution replace with new failities is the benefit best one, the solution add new facilities is the Timeliness best one.
3 educe immune genetic algorithm that used to get Optimize expansion project.
Keywords：AP facility; expand; site testing; cost; overlay
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