客運專線群社區的應用

Abstract

為了解決客運專線環境下GSM-R(GSM for Railway)系統的頻繁切換問題，本文在深入研究基於蜂窩移動通信中廣義群社區(Group Cell)和群切換(Group Handover)的基本概念與實現原理基礎上，針對客運專線高速應用環境，建立了GSM-R蜂窩網路的分散式多天線模型，並進行了仿真。仿真結果表明：空間分集技術實現了系統傳輸性能的極大提高，降低了發射功率，解決了高速率無線傳輸的電磁干擾問題；並提出了一種適合高速移動用戶使用的切換演算法，仿真結果表明該演算法減少了越區切換次數，並在一定程度上克服了乒乓效應。In order to overcome the frequent handover problem occurred in GSM-R system, this paper presents a new model of distributed multi-antenna system, based on the principle and implementation methods of generalized group cell and group handover in GSM system. Simulation results indicate that spacious diversity can improve the transmission performance while the transmitting power is reduced. And it could resolve the electromagnetic interference problem of high-speed wireless transmission. An improved handover algorithm, which is suitable for high-speed user, is also proposed in this paper, and the simulation results show that the algorithm can reduce the times of handover and overcome some of the Ping-pong effect.