TAKADA Yu, BANDAI Masaki, KITANI Tomoya, WATANABE Takashi
IEICE technical report, 2009, The Institute of Electronics, Information and Communication Engineers
This paper discusses a buffering strategy for a delay-tolerant multimedia sensor network (DTMSN), whose typical application is video surveillance. In DTMSN, a sensor node observes events and stores the data in its own buffer memory. All the data is collected to the sink. Sensor nodes have restrictions on buffer memory as well as battery capacity. In DTMSN, the generated data size is much larger than a node's memory size. Thus, a strategy for buffering satisfying these restrictions should be developed for DTMSN. In this paper, we propose a novel buffering method for DTMSN, called cooperative buffering (CB). In the proposed CB, a sensor node which has a large amount of data cooperates with its neighbor nodes to buffer them in a distributed manner. CB uses mobile sinks. The cooperatively buffered data are transmitted directly to the mobile sink when it arrives. In addition to the existing CB, we propose two buffering methods for easy data collection of mobile sinks. This paper discusses evaluates the power consumption performance and data collection delay of CB using the computer simulations. As a result, we show that it is important for decreasing total cost to select the CB method suitable for mobile sinks or application.