A Stochastic Geometry Analysis of CoMP-Based Uplink in Ultra-Dense Cellular Networks

The general tendency that cellular networks evolve toward small cells and ultimately ultra-dense networks (UDNs) will bring paradigm shift in network design. Cooperating multiple BSs for the service of a user, referred to as coordinated multipoint (CoMP), becomes feasible in UDNs to provide high quality of experience (QoE) for mobile users. To the best of our knowledge, we are the first to consider CoMP-based uplink transmission in UDNs. A simple CoMP uplink transmission scheme is firstly proposed to enable each user to transmit to multiple cooperating BSs with power control. The performance of the proposed scheme is analyzed using tools of stochastic geometry, in terms of outage probability and ergodic capacity, considering the effect of BS intensity, power control, and the number of cooperating nodes. Extensive simulation has been done and it is found that the proposed scheme could significantly improve outage probability and ergodic capacity of mobile users, as compared with non- CoMP scheme, especially in UDNs. Indications are also provided on network settings and parameter selection in CoMP-based uplink transmission in UDNs.