Wireless multi-hop relay network is expected to use in many situations such as ad-hoc network, sensor network and meshed network. But wireless network is susceptible to noise and multi-path fading, and so it cause degradation of communication quality. In order to suppress the degradation of communication quality, there is error-controlling scheme. When its scheme is used in multi-hop relay networks, communication quality is evaluated at an average in existing method. However, when reliable communication as dealing with medical information is required, the average assessment is inadequate. In this paper, we proposed the error-controlling scheme to allow for reliable-communication. To be more specific, depending on the channel environment of each link, perform to appropriate spread spectrum modulation and appropriate encoding. By performing the guaranteed of communication quality for each link as proposed method, even if it must communicate through the communication link which is especially bad channel, it is possible to suppress the degradation of communication quality.
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