無線網路行動台定位技術暨其應用於交遞演算法之研究

Mobile Location and its Application to Handover Algorithm in Wireless Networks

莊嶸騰(Rong-Terng Juang)

指導教授 ： 林信標 ； 林丁丙

國立臺北科技大學/機電學院/機電科技研究所/博士(2007年)

摘要

無資料

關鍵字

基地站台規劃 ； SADOA ； TDOA ； 行動台定位估測 ； 交遞演算法

並列摘要

This dissertation discusses cell planning, mobile location estimation and handover decision for cellular communication systems. First, this dissertation presents background noise measurements in urban Taipei city for the deployment of WCDMA (wideband code division multiple access) systems. The level of spectrum pollution is evaluated by using statistical parameters. Based on the measurements, a better solution using a genetic algorithm is proposed for the system deployment. Secondly, this dissertation presents the SADOA (Signal attenuation difference of arrival) location method. Each SADOA measurement yields a circle along which the MS (mobile station) may lie and multiple circles intersect at the estimated MS position. The SADOA method is combined with the TDOA (time difference of arrival) method to enhance the accuracy and penetration of location ability. The results of driving measurement show that the proposed location methods outperform the conventional methods in a GSM (global system for mobile communications) system. Finally, this dissertation discusses handover decision based on the MS mobility. The proposed algorithm makes necessary hard handovers by ascertaining the signal variation is dominated by path loss. This dissertation also presents a soft handover algorithm, which adds two hysteresis parameters including the MS distance and heading direction. Besides, this dissertation presents an efficient GSM/WCDMA intersystem handover algorithm, which considers the reliability of communication link, evaluated from the MS distance. Compared to conventional methods, the results show that the proposed algorithms reduce the number of unnecessary handovers and the mean size of active set while remain similar signal outage probability and increase data throughput in a real network.

並列關鍵字

Cell planning ； SADOA ； TDOA ； Mobile location ； Handover algorithm

參考文獻

[1] B. Smida, V. Sampath and P. Marinier, “Capacity degradation due to coexistence between second generation and 3G/WCDMA systems,” IEEE Conf. Veh. Technol., vol. 1, May 2002, pp. 95-99.

[2] K. Heiska, H. Posti, P. Muszynski, P. Aikio, J. Numminen and M. Hamalainen, “Capacity reduction of WCDMA downlink in the presence of interference from adjacent narrow-band system,” IEEE Trans. on Vehicular Technology, vol. 51, Issue 1, Jan. 2002, pp. 37-51.

[3] E. Amaldi, A. Capone and F. Malucelli, “Optimizing base station setting in UMTS networks,” IEEE Conf. Vehicular Technology, vol. 4, May 2001, pp. 2828-2832.

[4] C. Y. Lee and H. G. Kang, “Cell planning with capacity expansion in mobile communications: A Tabu search approach,” IEEE Trans. Vehicular Technology, vol. 49, no. 5, Sep. 2000, pp. 1678-1691.

[5] M. J. Nawrocki, and T. W. Wieckowski, “Optimal site and antenna location for UMTS output results of 3G network simulation software,” Int’l Conf. Microwaves, Radar and Wireless Commun., vol. 3, May 2002, pp. 890-893.