Abstract
In ultra-dense networks (UDNs), the interference management constitutes a great challenge due to the densely deployed base stations (BSs) and the traffic fluctuating with time. To tackle this challenge, the authors propose a cross-tier cooperation load-adapting interference management (CCLA-IM) scheme in UDNS, which employs three technologies to mitigate inter-cell interference (ICI) efficiently. Firstly, fractional frequency reuse technology is employed to coordinate the ICI among macro BSs (MBSs) as well as the ICI between MBSs and small BSs (sBSs). Secondly, they use load-adapting resource allocation technology to mitigate ICI further when the sBSs traffic is partially loaded. Thirdly, the interference-aware resource allocation can mitigate ICI further by optimising the physical resource blocks mapping methods. The simulation results show that the proposed CCLA-IM can achieve considerable performance gain in system spectral efficiency, the throughput of sBSs, system energy efficiency and ICI distribution while the density of sBSs and the traffic are changing with time.
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