Self-optimised Coordinated Traffic Shifting Scheme for LTE Cellular Systems

Mobility load balancing is widely used in LTE cellular systems to deal with the uneven load distribution. Its basic idea is to shift traffic from a hot-spot cell to less-loaded neighbouring cells, called partners. Conventional schemes focus on the hot-spot cell’s load reduction and pay less attention to the performance of partners. This paper proposes a self-optimised coordinated traffic shifting scheme. In the proposed scheme, the coordination among partners is considered. Meanwhile, the shifted traffic is adjusted dynamically according to the load balancing (LB) performance. Simulation results show the proposed scheme can keep low call blocking probability of partners. It can also keep the number of Ping-Pong LB and the LB handover dropping probability at low levels.