中繼站輔助細胞網路之下行效能與最佳化

Downlink Performance and Optimization of Relay-assisted Cellular Networks

林香君(Shiang-Jiun Lin) ； 沈文和(Wern-Ho Sheen,) ； 黃家齊(Chia-Chi Huang)

《電腦與通訊》 130期 (2009/12) Pp. 79-86

https://doi.org/10.29917/CCLTJ.200912.0011

摘要

中繼站輔助細胞網路架構是下一世代行動通訊系統中呼聲最高的網路架構之一。這樣的架構預期可以在室內、室外，高移動速度、低移動速度等多樣的環境下，提供使用者高速傳輸的多媒體服務。本篇文章針對中繼站輔助細胞架構之下行傳輸效能進行最佳化。綜合考量影響系統效能之系統參數：中繼站之佈放位置、使用者之路徑選擇、頻譜資源重用、資源配置等，利用基因演算法找出最佳系統頻譜使用效能。我們針對固定頻寬分配搭配兩種路徑選擇方式（鏈路之頻譜效率為考量，以及使用者接收之訊雜比為考量）進行研究，實驗結果顯示藉由中繼站的輔助資料傳輸可以大大提昇傳統細胞網路的系統效能。

關鍵字

中繼站 ； 中繼站輔助細胞網路 ； 系統頻譜效能 ； 基因演算法

並列摘要

Relay-assisted cellular network is one of the most promising architectures for the next-generation mobile cellular system, which is envisaged to support high-rate multimedia services in a wide variety of environments: indoors, outdoors, low-mobility, high-mobility, etc. This article aims to investigate the performance of downlink transmissions of relay-assisted cellular networks with optimized system parameters. A genetic algorithm-based approach is proposed for joint optimization of system parameters including locations of relay stations, path selection, reuse pattern and resource allocation to maximize the system spectral efficiency. The scenario of fixed-bandwidth allocation to each user is investigated along with two path selection schemes (spectral efficiency-based and SINR-based). Numerical results show that with the deployment of relay stations, the system performance is significantly improved over the conventional cellular networks.

並列關鍵字

Relay Station ； Relay-assisted Cellular Networks ； System Spectral Efficiency ； Genetic Algorithm