I. Introduction
THIS paper addresses the performance of several urban Sub 1GHz propagation path loss models which can be considered as reference models to design a new WLAN system that operates below 1GHz. We consider 2 empirical path loss models, the Lee model and the Hata Model and discuss a proposed urban path loss model as a candidate for a new WLAN system. To judge the model performance with real data we finally make a comparison with MIMO OFDM measurements which have been proposed in [1]. For the comparison study we assume a WLAN-based wireless smart grid network that uses the ISM-band (industrial, scientific and medical) to transmit measurement data from meter/sensor devices to data collection points in outdoor environments. Future smart grid communication will include data flows such as Advanced Metering Infrastructure (AMI), Demand-Response (DR), Wide-Area Situational Awareness (WASA), and Distribution Grid Management.