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