本文件提出了一个理论模型，用于估计所需的最小额外成本 现场测试设备天线路径上的衰减，以便模拟真实场景。该模型考虑了不同环境中的传播，例如密集或分散的城市区域，如 以及车内和行人场景。此外，为了提供估计器，模型使用了以前的 一组参数的确定值和已知值，如测量值和电话天线增益、电缆损耗、汽车 渗透，身体损失。该模型不适用于需要MIMO技术的HSPA环境和LTE环境。

The present document presents a theoretical model to be used for the estimation of the minimum required additional attenuation on the antenna path of the field test equipment in order for this to emulate the real life scenarios.The model takes into consideration propagation within different environments, such as dense or spread urban areas, as well as in car and pedestrian scenarios. In addition, in order to provide the estimator, the model uses previously determined and known values for a set of parameters such as measurement and phone antenna gain, cable loss, car penetration, body loss.The model is not applicable in the HSPA environments requiring MIMO technology and in the LTE environment.