Impact of Joint Transmission (JT) Coordinated Multipoint (CoMP) on Mobile Users in 5G Heterogeneous Network

Abstract

The vision to ensure ubiquitous connectivity with ultra-reliable low latency, inconceivably high data rate, and support a myriad of data-hungry devices is foreseen with the widespread rollout of the 5G network. Ensuring seamless connectivity at the cell edge amidst the significant prevalence of Intercell Interference (ICI) and path loss proves to be complicated. In addition, the impact of mobility poses particular challenges to the wireless network and the high frequency of 5G networks limits the coverage area. With increase in UE mobility, Doppler effect becomes significant enough to impair the mean data rate and induce call drops. Joint transmission Coordinated (JT CoMP) is a promising ICI mitigation technique where several eNBs coordinate to create a virtual antenna array and transmit downlink (DL) data simultaneously to serve the UEs with strong radio signal links. The transmitted signals from the coordinated eNBs act as the desired signal for the UEs, reducing the interference of undesired signals. This paper examines the influence of JT CoMP technology on user velocities by incorporating closed loop spatial multiplexing (CLSM) into the Heterogenous Network (HetNet) with the aim of improving signal reception at cell edge and minimizing the effect of ICI for mobile users. To realize the effectiveness of inter-site and intra-site JT CoMP schemes in ICI mitigation and boosting cell edge throughput for mobile users in HetNet, the simulation was conducted for HetNet with CoMP and non-CoMP deployment. With the proliferation of UE velocity, the performance of CLSM degrades and less detailed feedback is reported. On the contrary, the simulation results reveal that CLSM integrated intrasite based JT CoMP offers better signal reception for low velocities and intersite based JT CoMP provides better throughput at high velocities.