Summary
International Symposium on Antennas and Propagation
2010
Session Number:2WD2
Session:
Number:2WD2-3
On Distance Characteristics Parameters Evaluated by a Two-Ray Ground Reflection Model
Taro Tamaki, Kazunori Uchida, Junichi Honda,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Recently, in conjunction with the ubiquitous information and communication society, much effort has been focused on the development of efficient networks including both wired and wireless communications. In this study we consider field estimation for mobile terminals such as cellular phones and PHS moving around urban areas. In this case, MS (Mobile Station) must do hand-over from one BS (Base Station) to other to maintain quality of communications resulting in higher receiving powers. Failures of smooth hand-over lead to a poor quality of communications. One of these causes is a rapid disturbance of receiving powers due to reflections and diffractions by dense high rise buildings in urban areas [1], and the other is due to a poor access of MS to the appropriate BS. In the real situations, the attenuations might be complicatedly related to building heights and density of buildings in the urban or suburban areas, and it is very difficult to evaluate their characteristics. Therefore, we have proposed a simple estimation method for electric field distributions in urban or suburban areas where there exist several accessible BSs and we have determined amplitude modification α[dB], propagation order β and modification distance γ[m] using the proposed method by employing Hata’s equations which were empirically obtained from many outdoor data. In that study we have used estimation method using incident wave [2]. In this paper we determine α and β using the proposed estimation method with incident and reflection waves by comparing with Hata’s equations [3]. we neglect γ because it is very small compared with propagation distance. Then we simulate received powers when the MS moves around some cells, and we discuss the mechanism of hard and soft hand-overs for the MS in the cellular electromagnetic environments.