**2.1 Basic idea**

The idea behind our proposed algorithm, called successive scheduling scheme (SSS), is to schedule the packet transmission in successively fashion with the minimal interval of listen periods and a maximum interval of sleep periods without violating the QoS of all connections in an MSS. Additionally, the successive scheduling of time slots would reduce the number of status transitions between sleep periods and listen periods. This improvement greatly contributes to achieve the power-saving. The proposed approach can be adapted to the power-saving class of type III where the length of sleep and listen periods are variable.
