针对当前无线局域网中信道切换时延问题,设计了一种新的快速信道切换方案FCH-USRP(fast channel handoff w ith USRP)。通过使用USRP(universal softw are radio peripheral)设备对所处无线环境进行信道扫描,以提供及时准确的无线信道信息,从而减少用户的信道切换时延。实验结果表明该方案能够有效减少信道切换时延,并在较短时间内恢复中断的数据传输。 Aiming at the problem of channel switching delay in current wireless local area networks, a new fast channel handover (FCH-USRP) scheme is designed. The USRP (universal softw are radio peripheral) device is used to perform channel scanning on the radio environment to provide timely and accurate wireless channel information, so as to reduce user channel switching delay. Experimental results show that this scheme can effectively reduce the channel switching delay and resume the interrupted data transmission in a short period of time.