有鑑於用戶端的頻寬需求與日俱增，新一代無線通訊系統LTE-A（Long Term Evolution-Advanced）提出載波聚合（Carrier Aggregation）技術，使行動裝置能同時聚合多個分量載波（component carrier），以達成更高的傳輸速率。隨著多天線技術的發展，目前無線通訊系統中的傳輸端及接收端皆已配置多天線，藉由多天線的各種技術進一步提升傳輸速率及傳輸品質。載波聚合及多天線技術將會大幅影響每個用戶端的通道狀況，然而目前探討無線資源分配的研究中，皆未在載波聚合及多天線技術並存的系統中作討論。因此此篇論文是第一篇將載波聚合及多天線技術考慮進無線資源分配的論文。
在此篇論文中，我們考慮每個用戶端的傳送需求為一個有限佇列，在此狀況下視通道狀況將每個分量載波上的資源區塊（resource block）配置給多個用戶端。在分配完資源區塊後，我們接著必須決定此資源區塊所使用的調變與編碼方法，LTE-A的硬體設計規範在同個分量載波上分配給同個用戶端的資源區塊必須在同個數據流上使用共同的調變與編碼方法。這篇論文所要解決的問題是屬於NP-Hard難題，因此我們提出一個貪婪演算法試圖盡可能最大化吞吐量及盡量維持用戶端公平的原則下解決此問題。我們在文中證明此方法保證至少達到最佳解的一半效能。實驗模擬結果顯示，此方法的效能在各種情境下皆優於其他相關研究提出的方法。

[1] S. Adhikari, “Downlink transmission mode selection and switching algorithm for lte,” in Proceedings of 2011 Third International Conference on the Communication Systems and Networks (COMSNETS). IEEE, 2011, pp. 1–10.
[2] “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2,” 3rd Generation Partnership Project (3GPP), TS 36.300, Jun. 2012.
[3] “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures,” 3rd Generation Partnership Project (3GPP), TS 36.213, Jun. 2012.
[4] Y. Wang, K. I. Pedersen, T. B. Sorensen, and P. E. Mogensen, “Utility Maximization in LTEAdvanced Systems with Carrier Aggregation,” in Proceedings of the Vehicular Technology Conference (VTC Spring), 2011 IEEE, May 2011, pp. 1–5.
[5] S.-B. Lee, S. Choudhury, A. Khoshnevis, S. Xu, and S. Lu, “Downlink MIMO with Frequency-Domain Packet Scheduling for 3GPP LTE,” in Proceedings of the INFOCOM 2009, IEEE, Apr. 2009, pp. 1269–1277.
[6] “Feasibility study for Further Advancements for E-UTRA (LTE-Advanced),” 3rd Generation Partnership Project (3GPP), TR 36.912, Mar. 2011.
[7] “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation,” 3rd Generation Partnership Project (3GPP), TS 36.211, Jun. 2012.
[8] A. Jalali, R. Padovani, and R. Pankaj, “Data Throughput of CDMA-HDR a High EfficiencyHigh Data Rate Personal Communication Wireless System,” in Proceedings of the Vehicular Technology Conference (VTC Spring), 2000 IEEE, vol. 3, 2000, pp. 1854–1858.
[9] M. Andrews, “A Survey of Scheduling Theory in Wireless Data Networks,” in IMA Volumes in Mathematics and its Applications, vol. 143, 2007, pp. 1–18.
[10] H. J. Kushner and P. A. Whiting, “Asymptotic Properties of Proportional-Fair Sharing Algorithms,” in Proceedings of the 40th Annual Allerton Conference on Communication, Control, and Computing, 2002, pp. 1051–1059.
[11] G. L. Nemhauser, L. A. Wolsey, and M. L. Fisher, “An analysis of approximations for maximizing submodular set functions - I,” in Mathematical Programming, vol. 14, no. 1, Dec. 1978, pp. 265–294.
[12] M. L. Fisher, G. L. Nemhauser, and L. A. Wolsey, “An analysis of approximations for maximizing submodular set functions - II,” in Mathematical Programming Study, no. 8, 1978, pp.73–87.
[13] “LTE-EPC Network Simulator (LENA) - Iptechwiki.” [Online]. Available:
http://iptechwiki.cttc.es/LTE-EPC Network Simulator (LENA)
[14] “ns-3 network simulator.” [Online]. Available: http://www.nsnam.org/
[15] S. R. Honghai Zhang, Narayan Prasad, “MIMO Downlink Scheduling in LTE Systems,” in Proceedings of the INFOCOM 2012 Proceedings, IEEE, March 2012, pp. 2936–2940.
[16] H. S. Liao, P. Y. Chen, and W. T. Chen, “An Efficient Downlink Radio Resource Allocation with Carrier Aggregation in LTE-Advanced Networks,” Tech. Rep., Department of Computer Science, National Tsing Hua University, Hsin-Chu, 300, Taiwan, 2012.
[17] T. Dean and P. Fleming, “Trunking Efficiency in Multi-Carrier CDMA Systems,” in Proceedings of the Vehicular Technology Conference (VTC Fall), 2002 IEEE, vol. 1, 2002, pp.156–160.
[18] “Physical layer aspects for evolved Universal Terrestrial Radio Access (UTRA),” 3rd Generation Partnership Project (3GPP), TR 25.814, Sep. 2006.
[19] W. C. Jakes, Microwave Mobile Communications. New York: John Wiley & Sons Inc., Feb.1975.
[20] R. Jain, D. M. Chiu, and W. Hawe, “A Quantitative Measure of Fairness and Discrimination for Resource Allocation in Shared Computer System,” DEC, TR 301, Sep. 1984.