在真實世界的感測網路中，為了維護可靠度，常常會使用Acknowledgement的機制，造成sensor額外的能量消耗，也使得傳輸行為變得複雜；在本篇論文中，網路環境為使用tree-based topology，進行資料的收集並傳回root，即base station，所有sensor都採用可調整且能互不相同的傳輸能量等級，傳送ACK亦須要選擇使用不同傳輸能量等級。本篇論文希望在此環境下，探討建立最大生命週期的data gathering tree。

第一章、 Introduction 1
第二章、 802.15.4 Protocol Analysis And The Derivation of Error Performance 4
A. IEEE 802.15.4 Protocol 4
B. DerivationData Frame and ACK Frame Error Rate 9
C. Derivation Data Frame and ACK Frame transmitting expectation 11
第三章、 Sensor Network Model 15
第四章、 Maximum Lifetime Tree Problem 22
第五章、 Lower bound on the normalized load 24
第六章、 Proposed Algorithm 31
A. Partial Bound on the normalized load of the optimal data gathering tree problem 32
B. Definition of Improvement 36
C. Classification of nodes 37
D. Verification of principle 38
E. Detail of proposed algorithm 40
第七章、 Simulation 43
A. Simulation Model 43
B. Results for unreliable wireless sensor network 46
第八章、 Conclusion 50
第九章、 Reference 51

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