网络延长器，顾名思义，就是能够把网络传输距离有效延长的设备。网络延长器能够突破传统以太网传输距离100米以内的限制，可以将10BASE-TX的双绞线电信号延长到350米甚至更长。它将网络的传输距离的极限从铜线的100米扩展到数百米以上，可简便地实现集线器、交换机、服务器、终端机与远距离终端机之间的互连。
在保证网络安全通信的基础上，尽量减少网络的能源消耗、延长网络生命周期已经成为无线传感器网络通信的首要目标。
Reducing the source consume, and prolonging the WSN lifecycle is becoming the chief target of WSN, which was based on the assurance of Network Secure Communication.
降低能耗以延长网络生存时间是无线传感器网络设计中的一个重要挑战。
Reducing power consumption to extend network lifetime is one of the most important challenges in designing wireless sensor networks.
通过更合理的时隙分配以及对每个节点发射功率的控制，使得整个无线传感器网络的能耗降低，寿命延长。
Through reasonable time slot assignment and transmitting power control of each sensor node, for wireless sensor networks, the energy consumption is decreased and the lifetime is enlarged.
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