  In this contribution, the 3-dimensional (3D) channel characteristics,
particularly in the elevation domains, are extracted through measurements in
typical urban macro and micro environments in Xi'an China. Stochastic channel
model parameters are obtained based on the high-resolution multi-path parameter
estimates. In addition, a modified spatial channel model (SCM) for the
line-of-sight (LoS) scenario is proposed where the LoS polarization matrix is
parameterized in accordance with the reality. Measurement results justify the
reasonability of the proposed model. These works significantly improve the
applicability of the ITU SCM models in realistic 3D channel simulations.
