A Framework for the Automation of LTE Physical Layer Tests

The long term evolution (LTE) network architecture comprises, among other elements, the base station (eNodeB), which provides and controls the air interface. eNodeB protocol stack is composed of different layers, each one with specific purpose. In terms of air interface performance, the most critical layers of an eNodeB are the physical layer (PHY) and the medium access control layer (MAC). Both must operate on precise timing basis, corresponding to a frame duration of 1 ms. Because of this requirement, PHY layer developers need an effective test architecture, capable to follow time response policies. This article proposes an automated test framework for eNodeB’s physical layer development, comprising procedures for checking data integrity, stability and performance. This framework is based on a simplified LTE MAC layer, which operates as a software element that communicates directly with the physical layer and performs mapping procedures between logical and physical channels, reception and transmission of physical layer data, user data scheduling and data exchange with mobile terminals. All above mentioned procedures are performed with no further dependency on other LTE network elements, thus providing a stand-alone test framework.