As one of the effective way to overcome the digital divide issue in the lightly populated area, the BWA (Broadband Wireless Access) system is expected and field trials have been conducted extensively in Japan. This paper introduces the results of BWA field experiments conducted in a typical intermediate and mountainous area in Japan. In the BWA network, WiMAX units are used as relay stations and R-LAN units are structuring the meshed network. The result shows that the study of effective frequency utilization is important to realize the multi-hop relaying. It is also suggested that the multiple channel transmission in the meshed network needs the topological node allocation study to reduce delay affects.