在移动主机切换链路的时候，中转代理起到缓存的作用，可以减少所需要更改的路径的节点数量，同时减少切换开销。

The transmit agent acts as a buffer when the mobile node goes handoffs and reduces the overheads as same as the number of the hosts along the changing road which need to change.

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进而，我们将目标等价转化为最大化由代理任命而引起的总链路传输次数减少量。

Further, we convert our goal into an equivalent of maximizing the reduction in the number of total link transmissions incurred by the placement of proxies.

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