Advancement Through Research
A heterogeneous network (HetNet), typically a combination of macrocells and small cells, is a popular solution for Long Term Evolution (LTE) based 4G or 5G technologies as it can provide ubiquitous and cost-effective broadband user experience with higher network capacity. However, the interference issues are more complicated in LTE HetNets. The mobile and unknown locations of the User Equipment (UEs) add further difficulties to interference management in uplink spectrum where this uplink spectrum is a separate range from downlink for LTE FDD and the same range but on specific time slots for LTE TDD. Since the major source of this interference is the high power transmission from UEs, located in neighboring cells but far away from their serving eNodeBs, limiting this power can be greatly helpful. To mitigate interference in uplink spectrum by reducing power transmission from those UEs, a scheme is proposed in this paper for HetNets. The proposed scheme shifts the handover boundary from its conventional location for UEs, performing data transfer only in uplink. It can additionally help increase the battery life for these UEs and also, it limits a drop in uplink data rate due to clipping off power transmission level by the UE capability. Simulation has been performed to demonstrate the reduction in uplink power transmission in the proposed scheme.
LTE, HetNets, Interference, Cell Selection Offset (CSO), Handover
