逄愛君臺灣大學：資訊網路與多媒體研究所黃思偉Huang, Szu-WeiSzu-WeiHuang2007-11-272018-07-052007-11-272018-07-052007http://ntur.lib.ntu.edu.tw//handle/246246/58411這篇論文提出一個新的具有省電考量的MAC設計，為了改善IEEE 802.15.4無線感測網路MAC協定Nonbeacon模式的效能。此MAC設計包含兩個階段，排程交換階段及排程生成階段。在排程交換階段中，交換機制是相當簡單，並且藉由將排程參數包含在資料封包及回應封包中，來達到不需額外的傳輸，即可做到交換排程的動作。在排程生成階段，感測節點可以藉由排程參數產生新的睡眠及喚醒排程，並且使得整個感測網路中節點的排程收斂至單一排程。實驗結果證實我們的方法比規格上的，在有效利用能量上具有更好的效能。To improve the performance of the MAC protocol for IEEE 802.15.4-based wireless sensor networks in nonbeacon-enabled mode, this paper presents a new energy-efficient MAC design. Our proposed MAC design consists of two phases: schedule exchange phase and schedule generation phase. In the schedule exchange phase, exchanging schedules is simple and doesn't need extra overhead by that schedule parameters are piggybacked in DATA and ACK packets. In schedule generation phase, nodes adaptively determine the sleep-wakeup schedule by schedule parameters and the MAC design allows all nodes to converge on one schedule. The experimental results show that the MAC design achieves higher power efficiency than the original MAC protocol in nonbeacon-enabled mode.List of Figures III List of Tables IV 1 Introduction 1 2 IEEE 802.15.4 MAC 6 2.1 Beacon-Enabled Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Nonbeacon-Enabled Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 Our Proposed Energy-E±cient MAC Design 10 3.1 System Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.2 Schedule Exchange Phase . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.3 Schedule Generation Phase . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.3.1 Schedule Generation Operation . . . . . . . . . . . . . . . . . . . 15 3.3.2 Schedule Adjustment Operation . . . . . . . . . . . . . . . . . . . 17 4 Performance Evaluation 20 4.1 Simulation Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.2 Input Parameters and Output Measures . . . . . . . . . . . . . . . . . . 20 4.3 Numerical Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5 Conclusion 27 Bibliography 28478120 bytesapplication/pdfen-US無線感測網路具省電考量IEEE 802.15.4低功率無線個人區域網路Power SavingEnergy EfficiencyWireless Sensor NetworksLow Rate Wireless Personal Area Networks (LR-WPANs)thesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/58411/1/ntu-96-R93944018-1.pdf