Utilization of OVSF codes for service Enhancement of LTE-R

Abstract

The paper is focused on railway wireless communication reliability. Along with the review of the available work, the paper proposes use of 3G interface of eNodeB for fast moving trains with LTE interface. The LTE-R is the key technology which assigns resource blocks (RBs) to users. Due to the frequent handovers, the reliability is a key issue in fast moving trains. The railway communication is not limited to urban areas; in rural areas, LTE interface is available using public communication systems mostly which raises serious concerns of connectivity. In this paper, the eNodeB which is equipped with 3G interface is considered as an alternative of LTE resources in areas with 3G connectivity only and is used mostly for voice communication in areas where LTE resources are available. The proposed 3G interface uses orthogonal variable spreading factor (OVSF) codes as radio resources which suffer from code blocking problem with reduced interference. The work is compared in both scenarios when 3G interface is used and when it is uses only LTE-R. The throughput increases and calls drop out decreases considerably.