基于CSMA/CA协议的隐藏终端问题的改进  

Improvement of Hidden Terminal Problem Based on CSMA/CA Protocol

作　　者：姜绍君[1] 王颖[1] 

机构地区：[1]大连理工大学,辽宁大连116600

出　　处：《计算机技术与发展》2015年第1期33-36,共4页Computer Technology and Development

基　　金：国家自然科学基金资助项目(61172107)

摘　　要：在无线局域网中,当节点采用竞争方式访问信道时,隐藏终端和其他节点可能同时利用信道发送数据,引起数据碰撞。在CSMA/CA协议中,增加数据收发的控制分组,正确表示数据收发开始和停止的时间,代替网络分配矢量(NAV),使得隐藏终端和其他节点按照先后顺序发送数据,实现可靠的数据传输。在CC2530芯片设计的方法中,实验结果表明降低了隐藏终端干扰造成的误码率;在NS-2仿真器评估的方法中,仿真结果表明控制分组对于网络其他性能影响小。通过两种方法验证了改进MAC协议的有效性。When the node contends channel in wireless local area networks,it will occur data collision because the hidden terminal and other node may access channel concurrently. In the CSMA/CA protocol,the control packets is used for representing starting or stopping of data transmission time instead of Network Allocation Vector （ NAV） ,thus the data is send in sequence for the hidden terminal and other node,realizing reliable data transmission. Experiments on the CC2530 chip show that the error rate of hidden terminal interference is re-duced. Simulations on the NS-2 show that the control packets had less impact on other network performances. The effectiveness of im-proved MAC protocol is proved by two methods.

关 键 词：无线局域网 CSMA/CA 隐藏终端 CC2530 NS-2仿真 

分 类 号：TN915.01[电子电信—通信与信息系统]