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In the wireless sensor network, there are cluster based routing protocols for the network monitoring like LEACH. In earlier works, the data aggregation periods of these protocols are the same, although each cluster can have different environments or situations for time-varying. Thus, it occurred to inefficiently consume energy in non-interested areas. In addition, it is also inefficient in interested areas that require frequent measurements because of next measurement time is fixed regardless of current environment. Therefore, in this paper, we suggest that data aggregation periodic time is distinguished according to characteristics of the cluster. We designed MPDA (Multi-Periodic Data Aggregation) that is a new cluster based routing protocol based on the following suggestion. We distinguished the data aggregation period by considering the interested area that is needed to monitor frequently. The result of the experiments is that MPDA is better than LEACH in terms of a few errors and energy consumption.

In recent years, the demand for real-time multi-media service in WLAN environment rapidly increases due to the Wi-Fi smart phone user growth. In order to transmit real-time multimedia to many users, broadcast transmission is more efficient than unicast transmission. However, broadcast transmission without retransmissions leads to the higher loss rate in real wireless environments. In this paper, we propose a smart phone-based reliable multimedia transmission system with packet-level forward error correction scheme using Reed-Solomon code. According to our experimental results, the system shows the average packet delivery ratio between 90% and 95% regardless of interference strength.