智慧型通訊自我優化控制研究

Study of Self-Optimizing Control for Intelligent Communications System

蔡貴州(Kuei-Chou Tsai)

指導教授 ： 馬杰

元智大學/電機通訊學院/通訊工程學系/碩士(2013年)

https://doi.org/10.6838/YZU.2013.00308

摘要

論文針對新一代智慧型通訊系統設計自我優化控制，根據資料傳 輸方向可分為下行鏈路自我優化控制與上行鏈路自我優化控制。其中 下行鏈路自我優化控制是透過自我優化功率控制，當系統工作於通訊 品質較好的環境中，降低基站輸出功率輸出最小功率。當系統工作於 通訊品質較差的環境中，在低於基站輸出功率上限條件下，可提升輸 出功率以維持傳接機性能。為了解決在特定活動時，細胞內用戶過度 集中導致服務品質下降，本論文將規劃基站自我優化功率控制。配合 資源塊調配機制與扇區基站使細胞內頻譜、功率資源能更有效利用， 提升服務品質。 上行鏈路自我優化控制包含行動用戶自我優化功率控制器與基站 自我優化波束零化數控制器，上行鏈路自我優化功率控制機制與下行 鏈路自我優化功率控制機制相同，考慮行動用戶發射最小功率。此外， 本論文設計基站自我優化波束零化數控制機制，當行動用戶達最大發 射功率上限，仍無法達到系統所設定之SINR 閘限值時，將啟動基站自 我優化天線波束零化數控制機制，在多路徑角擴散環境中改變天線零 化數，藉以降低干擾功率，使接收機SINR 大於閘限值。

關鍵字

自我優化 ； 功率控制 ； 多路徑角擴散 ； 波束零化數控制 ； 位元錯誤率 ； 信號干雜比

並列摘要

The study of self-optimizing inter cell interference coordination (ICIC) control in heterogeneous network(HetNet) is the main purpose of the thesis. The thesis contains the design of self-optimizing power control (SOPC)
mechanism and the design of self-optimizing beam nulling control (SOBNC) mechanism. The optimization objective of SOPC is to make the uplink DBF-SC-FDMA and downlink DBF-OFDM transceivers to generate the minimum transmit power and the maximum average throughput under different data rate, number of mobile users, user speed and interference
power autonomously. The optimization objective of SOBNC is to make the uplink DBF-SC-FDMA transceiver to generate the minimum interference power under different angular spread and interference power
autonomously.
The SOPC mechanism can also use the positioning results to transmit stronger power and assign more data rate on the direction of a higher number of mobile users, and thus improve system average throughput. The SOBNC, which estimates the signal-to-interference-plus-noise ratio (SINR), the DOAs of target signals and interference signals, and angular spread from the reception signals of smart array antenna, is able to autonomously assign the proper number of nulls to the adaptive digital beamformer (DBF)in the varying interference power and angular spread environments to achieve the optimum objectiveness of maintaining the output SINR higher than a threshold value.

並列關鍵字

heterogeneous network ； inter cell interference coordination ； angular spread ； power control ； beam nulling extension ； bit error rate ； signal-to-interference-plus-noise ratio

參考文獻

[2] Smarter self-organizing networks, Ericsson white paper, 284 23-3169 Uen, Feb. 2012.

[4] S. P. Yeh, S. Talwar, G. Wu, N. Himayat, and K. Johnsson, Intel Coporation, ”Capacity and Coverage Enhancement in Heterogeneous Networks” , IEEE Wireless Communication, June 2011.

[5] G. Boudreau, J. Panicker, N. Guo, N. Wang, and S. Vrzic, Notel,“ Interference Coordination and Cancellation for 4G Networks”, IEEE Communications Magazine, April 2009.

[10] P. Petrus, J.H. Reed, and T.S. Rappaport, “Geometrical-based statistical macrocell channel model for mobile environments,” IEEE

Trans. Commun., Vol. 50, Issue 3, pp. 495 – 502, March 2002.