異質網路與多用戶多輸入輸出技術被視作是下一代通訊網路對頻譜使用效率問題可能的解決方案，兩者未來也勢必並存於同一系統中。而異質網路中的用戶，其服務品質很容易受到鄰近基地台的干擾，限制了系統的整體效能。
對此 3GPP LTE 標準提出了增強型細胞間干擾消除機制，同時使用多點協調來降低基地台間的干擾。

現今的研究多將多用戶多輸入輸出與多點協調視作兩個獨立的傳輸模式，根據排程器的決策在兩者間進行切換，缺少了混合兩者的相關研究。我們無法保證每次排程都能選到足夠且適當的多點協調用戶，導致基地台產生天線閒置的情形。

本文提出了在異質網路中考慮用戶通道狀況與公平性後，挑選數個用戶同時進行多用戶多輸入輸出與多點協調的混合式天線分配排程器，並以模擬方式提供各種傳輸模式下的數值比較作為排程方法的驗證。

Heterogeneous networks (HetNets) and Multi-user MIMO (MU-MIMO) are possible solutions for spectrum efficiency problem in the next generation mobile communication.
They will coexist in the future.

However, the users in HetNets are sensitive to inter-cell interference, limit the system performance.
Thus, 3GPP LTE designs enhanced inter-cell interference coordination (eICIC) and uses coordinated multi-point (CoMP) to cancel the interference.

Recently works consider MU-MIMO and CoMP as two transmission modes and switch them by scheduling, do not have a mode mix two. It cannot commit to find enough appropriate CoMP users in every scheduling duration, results to the existence of idle antennas .

In this paper, we proposed a mixed antenna allocation scheduler that take channel qualities and fairness in consider to select several users to do MU-MIMO and CoMP at once. We provide simulation results based on different transmission modes for comparing, verify the method we proposed.

[1] 3GPP TS 36.211 V12.5.0 (2015-03) Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation
[2] Damnjanovic, A.; Montojo, J.; Yongbin Wei; Tingfang Ji; Tao Luo; Vajapeyam, M.; Taesang Yoo; Osok Song; Malladi, D., "A survey on 3GPP heterogeneous networks," Wireless Communications, IEEE , vol.18, no.3, pp.10,21, June 2011
[3] 3GPP TR 36.932 V12.1.0 (2013-03) Scenarios and requirements for small cell enhancements for E-UTRA and E-UTRAN
[4] Lindbom, Lars, et al. "Enhanced inter-cell interference coordination for heterogeneous networks in LTE-Advanced: A survey." arXiv preprint arXiv:1112.1344 (2011).
[5] 3GPP TR 36.839 V11.1.0 (2012-12) Evolved Universal Terrestrial Radio Access (E-UTRA); Mobility enhancements in heterogeneous networks
[6] Soret, B.; Hua Wang; Pedersen, K.I.; Rosa, C., "Multicell cooperation for LTE-advanced heterogeneous network scenarios," Wireless Communications, IEEE , vol.20, no.1, pp.27,34, February 2013
[7] Deb, S.; Monogioudis, P.; Miernik, J.; Seymour, J.P., "Algorithms for Enhanced Inter-Cell Interference Coordination (eICIC) in LTE HetNets," Networking, IEEE/ACM Transactions on , vol.22, no.1, pp.137,150, Feb. 2014
[8] Somasundaram, K., "Proportional Fairness in LTE-Advanced Heterogeneous Networks with eICIC," Vehicular Technology Conference (VTC Fall), 2013 IEEE 78th , vol., no., pp.1,6, 2-5 Sept. 2013
[9] Yujie XU; Wen’an ZHOU; Xianqi LU; Te LIANG; Xiaotao REN; "A Novel CoMP Based eICIC Scheme for LTE-A Macro-Pico Het-net," Journal of Computational Information Systems 9, 13, 5117–5124, 2013
[10] Xiaona Li; Qimei Cui; Yinjun Liu; Xiaofeng Tao, "An effective scheduling scheme for CoMP in heterogeneous scenario," Personal Indoor and Mobile Radio Communications (PIMRC), 2012 IEEE 23rd International Symposium on , vol., no., pp.870,874, 9-12 Sept. 2012
[11] Uk Jang; Kang Yong Lee; Kee Seong Cho; Won Ryu, "Transmit Beamforming Based Inter-Cell Interference Alignment and User Selection with CoMP," Vehicular Technology Conference Fall (VTC 2010-Fall), 2010 IEEE 72nd , vol., no., pp.1,5, 6-9 Sept. 2010
[12] Sen Wang; Fei Wang; Yafeng Wang; Dacheng Yang, "A novel scheduling scheme based on MU-MIMO in TD-LTE uplink," Wireless Communications and Networking Conference (WCNC), 2011 IEEE , vol., no., pp.915,919, 28-31 March 2011
[13] Xinying Gao; Anxin Li; Hidetoshi Kayama, "Low-complexity downlink coordination scheme for multi-user CoMP in LTE-Advanced system," Personal, Indoor and Mobile Radio Communications, 2009 IEEE 20th International Symposium on , vol., no., pp.355,359, 13-16 Sept. 2009
[14] Davydov, A.; Morozov, G.; Bolotin, I.; Papathanassiou, A., "Evaluation of Joint Transmission CoMP in C-RAN based LTE-A HetNets with large coordination areas," Globecom Workshops (GC Wkshps), 2013 IEEE , vol., no., pp.801,806, 9-13 Dec. 2013
[15] Zhilan Xiong; Hongwei Yang; Yan Meng; Yuwen Pan; Min Zhang, "Feedback and Scheduling for Coordinated Beamforming of CoMP in LTE-Advanced System," Vehicular Technology Conference (VTC Fall), 2013 IEEE 78th , vol., no., pp.1,5, 2-5 Sept. 2013
[16] 3GPP TR 36.814 V9.00 (2010-03) Evolved Universal Terrestrial Radio Access (E-UTRA); Further advancements for E-UTRA physical layer aspects
[17] Shengchun Huang; Hao Yin; Jiangxing Wu; Leung, V.C.M., "User Selection for Multiuser MIMO Downlink With Zero-Forcing Beamforming," Vehicular Technology, IEEE Transactions on , vol.62, no.7, pp.3084,3097, Sept. 2013