The evolving fifth generation (5G) cellular wireless networks are envisionedto overcome the fundamental challenges of existing cellular networks, e.g.,higher data rates, excellent end-to-end performance and user-coverage inhot-spots and crowded areas with lower latency, energy consumption and cost perinformation transfer. To address these challenges, 5G systems need to adopt amulti-tier architecture consisting of macrocells, different types of licensedsmall cells, relays, and device-to-device (D2D) networks to serve users withdifferent quality-of-service (QoS) requirements in a spectrum andenergy-efficient manner. Starting with the visions and requirements of 5Gmulti-tier networks, this article outlines the challenges of interferencemanagement (e.g., power control, cell association) in these networks withshared spectrum access (i.e., when the different network tiers shares the samelicensed spectrum). It is argued that the existing interference managementschemes will not be able to address the interference management problem inprioritized 5G multi-tier networks where users in different tiers havedifferent priorities for channel access. In this context, a survey andqualitative comparison of the potential existing cell association and powercontrol schemes is provided to demonstrate their limitations for interferencemanagement in 5G networks. Open challenges are highlighted and guidelines areprovided to modify the existing schemes in order to overcome these limitationsand make them suitable for the emerging 5G systems.
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