行動通訊網路中合作式通訊之公平性研究

在本論文中，我們主要是研究在行動電話系統中，合作式通訊的利益分享所衍生的公平性之議題。藉由合作式通訊，使用者可利用空間多樣性的增益來獲取利益，例如漸少傳輸能源，或是降低通訊中斷的機率等等。然而，使用者彼此間可能會有不同的傳輸負載量，也就是說使用者所要傳輸的封包數量不盡相同，若使用在相同傳輸負載量的情況所導出的最佳能源分配方法，對於合作者的利益分享是不公平的。因此，在考慮系統效率的情況下，我們定義了公平指數來達到公平利益分享的目標。數值結果顯示出我們所定義的公平指數是合理的而且此合作是有效率的。此外，為了偵測合作夥伴是否因為私心而在合作中做了欺騙的動作，我們提出了一個防欺騙的封包傳遞演算法，模擬結果顯示了此演算法的可行性。最後，在多重用戶的系統中，為了儘可能達到使用者間完全的合作，我們也提出了一個選擇合作夥伴的演算法。模擬結果不僅顯示出此演算法的可行性，而且也指出，根據不同的利益準則，配對的結果和順序也將有所不同。

關鍵字

合作式通訊；公平性；轉傳節點選擇

並列摘要

In this thesis, we study the cooperative communication with fair utility sharing in mobile cellular systems. By cooperating, users can exploit spatial diversity gains to get utility, such as power savings, reductions to probability of outage etc. However, users may have different traffic loads, i.e., the numbers of transmitting packets among users may not be the same. Thus, adopting the optimum power allocations derived from the situation of the same traffic loads may not be fair for the utility sharing. Therefore we define the Fairness Index (FI) to achieve fair utility sharing with the consideration of system efficiency. Numerical results show that the FI we defined is reasonable and the cooperation is efficient. In addition, we propose a cheat-proof packet forwarding algorithm to detect whether the cooperative partner cheats in cooperation due to selfishness of users. The simulation results show the feasibility of this algorithm. Final, in order to achieve cooperation as full as possible, we also propose an algorithm to select partners in multiuser systems. The simulation results not only show that this algorithm is feasible but also indicate that, based on different utility criteria, the match outcomes and the match order will be different.

並列關鍵字

cooperative communication ； fairness ； relay selection

參考文獻

[1] Y.-W. Hong, W.-J. Huang, F.-H. Chiu, and C.-C. J. Kuo, “Cooperative Communications in Resource-Constrained Wireless Networks,” IEEE Signal Process. Mag. vol. 24, no. 3, pp. 47-57, May 2007

[2] Xinmin Deng and A. M. Haimovich, “Power allocation for cooperative relaying in wireless networks,” IEEE comm. letters, vol. 9, no. 11, pp. 994-996, Nov. 2005.

[3] Y. Zhao, R. Adve, and T. Lim, “Improving amplify-and-forward relay networks: Optimal power allocation versus selection,” in Proc. IEEE Int. Symp. Information Theory (ISIT), pp. 1234-1238, July 2006

[4] J. Luo, R. S. Blum, L. Cimini, L. Greenstein, and A. Haimovich, “Power Allocation in a Transmit Diversity System with Mean Channel Gain Information” IEEE comm. letters, vol. 9, no. 7, pp. 616-618, July. 2005

[5] Min Chen, S. Serbetli, and A. Yener, “Distributed Power Allocation for Parallel Relay Networks,” IEEE Global Telecommunications Conf. vol. 3, pp. 1177-1181, Nov. 2005

國際替代計量

行動通訊網路中合作式通訊之公平性研究

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