基于IP的位置识别利用了用户的网络信息，包括子网、网络掩码和路由器的mac地址。
IP-based location awareness USES the user's network information, including subnet, net mask, and the Mac address of the router.
在你家找个中心位置，把路由器放桌上或者放书架上。
Find a central location in your home and put your router on a table or bookshelf.
当移动主机位置改变时，数据流的路由改变了，那么分组延迟可能会改变，因为新的路由上的路由器会获得不同的路径长度和不同的排队延迟。
When mobile host changes its position, the route of the flow changes, which may causes the change of packet delay as routers on the new route may gain different path length and queuing delay.
当移动主机位置改变时，数据流的路由改变了，那么分组延迟可能会改变，因为新的路由上的路由器会获得不同的路径长度和不同的排队延迟。
When mobile host changes its position, the route of the flow changes, which may causes the change of packet delay as routers on the new route may gain different path length and queuing delay.
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