高速无线局域网媒体竞争接入优化

Optimization on media competition access to high speed WLAN

针对目前体育场、客运站、办公区等高密度节点环境下,无线局域网(wireless local area networks, WLAN)接入缓慢和上下行数据传输不平衡的特点,基于物理层的正交频分多址(orthogonal frequency-division multiple access, OFDMA)和多用户多输入多输出(multi-user multiple-input multiple-output, MU-MIMO)技术,提出有序混合竞争的媒体访问控制(media access control, MAC)协议。该协议通过初次随机筛选一定数量的节点完成同步上行传输,而剩余节点参加下一轮的混合竞争,增加竞争节点接入的有序性,以提高高密度节点环境下的系统性能。根据该协议特性建立一个数学模型,通过改变模型参数进行模拟,结果显示该协议能够有效改善高密度节点竞争接入WLAN的性能。

Under the current high-density node environment, such as stadiums, passenger stations, and office zones, accessing wireless local area networks (WLAN) is slow, and the transmission between uplink data and downlink data is unbalanced. In view of the above defects, based on the orthogonal frequency-division multiple access (OFDMA) of the physical layer and the multi-user multiple-input multiple-output (MU-MIMO) technology, an ordered hybrid competitive media access control (MAC) protocol is proposed. In the protocol, the simultaneous uplink data transmission is achieved by initially selecting a certain number of nodes randomly, and the remaining nodes participate in the next round of hybrid competition to increase the orderliness of the competition node access and improve the system performance under the high-density node environment. A mathematical model is established according to the characteristics of the protocol, the model is simulated by changing the model parameters, and the results show that this protocol can improve the performance of high-density nodes accessing WLAN in competition.