Effects of Airy Buildings to Micro-cell Path Loss Prediction on 2-D Maps

In modern communication, network planning is very important for high quality service both coverage area and QoS including outage probability reduction. These require a tool, which is easy to use in planning the cellular network with high accuracy not only between base station and a mobile unit but also multi-hop network. There are many tools or models for cellular network planning such as semi-deterministic model, Xia et al. [1] proposed path loss formulas for microcells in low-rise and high-rise building environments. Additionally, COST 231 Walfisch-Ikegami model [2] is also a popular prediction tool for micro cell environments. The models need the environment data base in details such as an average height of building rooftop, street width etc. However in the case of the airy building which has no full concrete walls and/or windows, the dominant wave does not diffract at the roof edge but it propagates through the building and diffracts at the edge of a railing. Therefore the height of building rooftop can not be used. To solve this problem, we propose a airy building effect in the Xia model. A preliminary test provided a better solution compared with measured path losses.