Realization of CDMA-based IoT Services with Shared Band Operation of LTE in 5G

摘要

5G network is envisioned to deploy a massive Internet-of-Things (IoTs) withrequirements of low-latency, low control overhead and low power. Current 4Gnetwork is optimized for large bandwidth applications and inefficient to handleshort sporadic IoT messages. The challenge here spans multiple layer includingthe radio access and the network layer. This paper focus on reusing CDMA accessfor IoT devices considering event-driven and latency sensitive traffic profile.We propose a PHY/MAC layer design for CDMA based communication for low powerIoT devices. We propose and evaluate coexisting operation of CDMA based IoTnetwork in presence of the exiting LTE network. Our proposed design willintegrate IoT traffic with legacy system by minimal modification at the edgenetwork, essentially eNodeB. We show that the underlay CDMA IoT network meetsIoT data traffic requirements with minimal degradation (3%) in the LTEthroughput. We also implement the proposed design using Software Defined Radiosand show the viability of the proposal under different network scenarios.