Cross-tier interference management schemes in cognitive heterogeneous networks

Abstract

To satisfy the ever-increasing data rate and service coverage demands, wireless communication networks evolve into heterogeneous networks (HetNets), where low-cost small base stations are embedded in conventional macrocells. Intercell interference emerges as the key capacity-limiting factor in such dense networks, restricting the reusability of spectral resources. Therefore, advanced interference mitigation techniques relying on multi-cell cooperation have attracted significant attention from the wireless industry and academia. This paper discusses interference management schemes for multi-tiered spectrum access in next-generation HetNets. A novel scheme based on full system cognition and base station cooperation is proposed as an enabler for high-capacity HetNets. In addition, practical implementation and operational challenges are investigated.

An efficient radio frequency channel distribution in 5g heterogeneous cellular networks for avoiding cross-tier interference in macro and small cells

“…The SINR of the macro and femto User Equipment should be equal to or better than the SINR threshold of the femto base station and the macro base station for good quality of service (QoS) of applications of a high bandwidth without delay or jitter. Further maximisation of throughput and the SINR results in the reduction or elimination of inter-cell interference in macro and femto cells as shown in equation (6) and (7).…”

“…The objective function in (5) is to maximise the sum throughput of femto and macro users in the heterogeneous network. The SINR requirements of the macro user equipment (MUE) and the femto user equipment (FUE) are mentioned in (6,7) whereas α and β are the SINR thresholds for the macro and femto networks. The RF channel allocation strategy for allocation of RF channels to macro user equipment (MUE) and femto user equipment (FUE) is based on three constraints.…”