在行動通訊系統下高樓層站台頻率規劃之研究

The Study of Frequency Planning for High Building BTS in Mobile Communication System

陳雨含(Yu-Han Chen)

指導教授 ： 張進福

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2009年)

https://doi.org/10.6342/NTU.2009.03045

摘要

本研究的目的在於探討在3G與LTE環境下高樓層站台的頻率規劃方式，希冀藉此找出合適的佈建策略，並對系統品質進行優化。為了達到目的，我們首先針對3G高樓層站台佈建分析優缺點，提出使用第三載波的策略，再調整跨頻率細胞重選（IFCR, Inter-frequency Cell Reselection）與跨頻率交遞（IFHO, Inter-frequency Handover）參數，確保系統的QoS品質。

在LTE環境下我們考慮軟性頻率重用（SFR-Soft Frequency Reuse）以改善基地台細胞邊緣用戶訊雜比（SINR），結合單位時間內細胞重選次數之參數來判斷用戶速度，依據速度分為高速/中速/低速三個群組，對應不同換手判斷條件，藉此縮短換手時間，減少換手（Handover）次數，以期能減低換手失敗率（Handover Failure Rate）來提高通話完成率（Call Completed Rate）。

LTE高樓層站台涵蓋重疊造成與3G類似的干擾問題，我們提出回授用戶的平均SINR來動態調整細胞中心範圍之策略，藉此降低每個細胞間用戶使用軟性頻率重用時的同載波干擾，以提升系統效能。

關鍵字

3G ； LTE ； 高樓層站台 ； 頻率規劃 ； 軟性頻率重用

並列摘要

The objective of this thesis is to discuss the method of frequency planning for high building BTS in 3G and LTE mobile system. We want to find the purpose network planning strategy and optimize the system performance. In order to reach the goal, we analyzed the advantages and disadvantages of 3G’s high building BTS at first. The proposed method is using the third carrier frequency. Then we adjust the parameter of inter-frequency cell-reselection and inter-frequency handover to ensure the good QoS.

To improve the SINR of those users in the cell edge border, soft frequency resue (SFR) must be considered in LTE. We decide the user’s speed for 3 schemes-high speed / medium speed / normal according to the number of cell reselection in unit time. For different speed we give it the corresponding handover decision criteria to shorten the handover’s time. So that we can reduce the handover failure rate and raise the call completed rate.

In LTE, high building BTS also have the same coverage overlap problem as in 3G. We propose the feedback cell center user’s average SINR strategy to adjust the border of cell center. This method can reduce the inter-channel interference caused by overlapping with neighboring cells. Therefore the system performance is improved.

並列關鍵字

3G ； LTE ； High Building BTS ； Frequency Planning ； SFR

參考文獻

[1] Mustafa Ergen. Mobile Broadband-Including WiMAX and LTE. 2009.

[2] Jorg Eberspacher, Hans-Jorg Vogel, Christian Bettstetter and Christian Hartmann. GSM-Architecture Protocols and Services. 2009.

[5] 3GPP TS36.300 V8.7.0. E-UTRA, Evolved Universal Terrestrial Radio Access (E-UTRA); Overall description. December 2008.

[6] 3GPP TR23.882 V8.0.0. 3GPP system architecture evolution (SAE): Report on technical options and conclusions. September 2008.

[13] Naizheng Zheng and Jeroen Wigard. On the Performance of Integrator Handover Algorithm in LTE Networks. 2008 IEEE.